LeetCode-Solutions

A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

LeetCode Topics

Array

0001-two-sum
0011-container-with-most-water
0015-3sum
0018-4sum
0031-next-permutation
0033-search-in-rotated-sorted-array
0037-sudoku-solver
0042-trapping-rain-water
0048-rotate-image
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0066-plus-one
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0085-maximal-rectangle
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0128-longest-consecutive-sequence
0135-candy
0139-word-break
0152-maximum-product-subarray
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0238-product-of-array-except-self
0283-move-zeroes
0303-range-sum-query-immutable
0347-top-k-frequent-elements
0368-largest-divisible-subset
0378-kth-smallest-element-in-a-sorted-matrix
0407-trapping-rain-water-ii
0416-partition-equal-subset-sum
0417-pacific-atlantic-water-flow
0455-assign-cookies
0474-ones-and-zeroes
0496-next-greater-element-i
0498-diagonal-traverse
0503-next-greater-element-ii
0523-continuous-subarray-sum
0542-01-matrix
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0645-set-mismatch
0679-24-game
0692-top-k-frequent-words
0717-1-bit-and-2-bit-characters
0724-find-pivot-index
0759-set-intersection-size-at-least-two
0797-rabbits-in-forest
0830-largest-triangle-area
0854-making-a-large-island
0905-length-of-longest-fibonacci-subsequence
0909-stone-game
0917-boats-to-save-people
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0934-bitwise-ors-of-subarrays
0940-fruit-into-baskets
0944-delete-columns-to-make-sorted
0945-snakes-and-ladders
0952-word-subsets
0954-maximum-sum-circular-subarray
0960-delete-columns-to-make-sorted-iii
0979-di-string-match
1006-vowel-spellchecker
1016-subarray-sums-divisible-by-k
1018-binary-prefix-divisible-by-5
1034-subarrays-with-k-different-integers
1049-minimum-domino-rotations-for-equal-row
1200-minimum-absolute-difference
1227-number-of-equivalent-domino-pairs
1231-replace-elements-with-greatest-element-on-right-side
1262-greatest-sum-divisible-by-three
1266-minimum-time-visiting-all-points
1287-distance-between-bus-stops
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1293-three-consecutive-odds
1305-number-of-visible-people-in-a-queue
1306-minimum-absolute-difference
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1364-tuple-with-same-product
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1407-group-the-people-given-the-group-size-they-belong-to
1421-find-numbers-with-even-number-of-digits
1424-maximum-candies-you-can-get-from-boxes
1426-find-n-unique-integers-sum-up-to-zero
1477-product-of-the-last-k-numbers
1478-maximum-number-of-events-that-can-be-attended
1479-construct-target-array-with-multiple-sums
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1497-design-a-stack-with-increment-operation
1503-reducing-dishes
1510-find-lucky-integer-in-an-array
1524-string-matching-in-an-array
1538-maximum-points-you-can-obtain-from-cards
1552-build-an-array-with-stack-operations
1580-shuffle-the-array
1586-longest-subarray-of-1s-after-deleting-one-element
1590-make-sum-divisible-by-p
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1628-count-submatrices-with-all-ones
1631-number-of-sub-arrays-with-odd-sum
1656-count-good-triplets
1694-make-sum-divisible-by-p
1700-minimum-time-to-make-rope-colorful
1813-maximum-erasure-value
1819-construct-the-lexicographically-largest-valid-sequence
1834-minimum-number-of-people-to-teach
1835-decode-xored-permutation
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
1876-map-of-highest-peak
1877-minimize-maximum-pair-sum-in-array
1878-check-if-array-is-sorted-and-rotated
1917-maximum-average-pass-ratio
1927-maximum-ascending-subarray-sum
1975-minimum-distance-to-the-target-element
1975-maximum-matrix-sum
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2048-build-array-from-permutation
2054-two-best-non-overlapping-events
2079-delete-duplicate-folders-in-system
2107-find-unique-binary-string
2110-number-of-smooth-descent-periods-of-a-stock
2137-final-value-of-variable-after-performing-operations
2144-maximum-difference-between-increasing-elements
2145-grid-game
2150-kth-smallest-product-of-two-sorted-arrays
2160-minimum-operations-to-make-a-uni-value-grid
2170-count-number-of-maximum-bitwise-or-subsets
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2229-maximum-fruits-harvested-after-at-most-k-steps
2237-longest-palindrome-by-concatenating-two-letter-words
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2267-minimum-difference-in-sums-after-removal-of-elements
2274-keep-multiplying-found-values-by-two
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2307-replace-non-coprime-numbers-in-array
2308-divide-array-into-equal-pairs
2320-find-all-k-distant-indices-in-an-array
2324-find-triangular-sum-of-an-array
2358-number-of-ways-to-split-array
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2400-minimum-score-after-removals-on-a-tree
2429-design-a-food-rating-system
2432-number-of-zero-filled-subarrays
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2527-count-subarrays-with-fixed-bounds
2529-range-product-queries-of-powers
2533-bitwise-xor-of-all-pairings
2551-apply-operations-to-an-array
2552-maximum-sum-of-distinct-subarrays-with-length-k
2564-most-profitable-path-in-a-tree
2614-maximum-count-of-positive-integer-and-negative-integer
2625-increment-submatrices-by-one
2626-count-the-number-of-good-subarrays
2661-smallest-missing-non-negative-integer-after-operations
2665-minimum-time-to-repair-cars
2668-form-smallest-number-from-two-digit-arrays
2681-put-marbles-in-bags
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2690-house-robber-iv
2691-count-vowel-strings-in-ranges
2698-find-the-array-concatenation-value
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2720-minimize-the-maximum-difference-of-pairs
2730-maximum-or
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2764-maximum-number-of-fish-in-a-grid
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
2856-count-complete-subarrays-in-an-array
2866-longest-even-odd-subarray-with-threshold
2881-split-strings-by-separator
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
2917-count-pairs-whose-sum-is-less-than-target
2975-maximum-square-area-by-removing-fences-from-a-field
3001-apply-operations-to-maximize-score
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3034-points-that-intersect-with-cars
3047-find-the-largest-area-of-square-inside-two-rectangles
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3194-find-words-containing-character
3213-count-subarrays-where-max-element-appears-at-least-k-times
3219-make-lexicographically-smallest-array-by-swapping-elements
3227-find-missing-and-repeated-values
3241-divide-array-into-arrays-with-max-difference
3251-maximum-area-of-longest-diagonal-rectangle
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3309-count-prefix-and-suffix-pairs-i
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3321-type-of-triangle
3332-minimum-operations-to-exceed-threshold-value-ii
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3379-transformed-array
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3429-special-array-i
3430-count-days-without-meetings
3433-count-mentions-per-user
3434-find-the-number-of-distinct-colors-among-the-balls
3437-maximum-total-damage-with-spell-casting
3453-separate-squares-i
3454-separate-squares-ii
3459-find-the-minimum-area-to-cover-all-ones-ii
3461-find-the-minimum-area-to-cover-all-ones-i
3463-alternating-groups-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3512-minimum-operations-to-make-array-sum-divisible-by-k
3577-count-the-number-of-computer-unlocking-permutations
3578-count-partitions-with-max-min-difference-at-most-k
3581-the-two-sneaky-numbers-of-digitville
3592-find-x-sum-of-all-k-long-subarrays-ii
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3612-adjacent-increasing-subarrays-detection-i
3619-adjacent-increasing-subarrays-detection-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3622-maximum-frequency-of-an-element-after-performing-operations-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3634-minimum-removals-to-balance-array
3637-trionic-array-i
3639-zero-array-transformation-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3640-trionic-array-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3648-find-the-maximum-number-of-fruits-collected
3651-minimum-cost-path-with-teleportations
3652-best-time-to-buy-and-sell-stock-using-strategy
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3685-count-subarrays-of-length-three-with-a-condition
3707-find-the-most-common-response
3721-longest-balanced-subarray-ii
3733-length-of-longest-v-shaped-diagonal-segment
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3747-maximum-difference-between-adjacent-elements-in-a-circular-array
3748-sort-matrix-by-diagonals
3788-maximum-unique-subarray-sum-after-deletion
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3794-find-the-minimum-amount-of-time-to-brew-potions
3851-find-sum-of-array-product-of-magical-sequences
3863-power-grid-maintenance
3884-minimum-absolute-difference-in-sliding-submatrix

Two Pointers

0011-container-with-most-water
0015-3sum
0018-4sum
0031-next-permutation
0042-trapping-rain-water
0075-sort-colors
0167-two-sum-ii-input-array-is-sorted
0283-move-zeroes
0455-assign-cookies
0696-count-binary-substrings
0768-partition-labels
0868-push-dominoes
0917-boats-to-save-people
0979-di-string-match
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1877-minimize-maximum-pair-sum-in-array
2236-maximum-twin-sum-of-a-linked-list
2265-partition-array-according-to-given-pivot
2320-find-all-k-distant-indices-in-an-array
2392-successful-pairs-of-spells-and-potions
2497-maximum-matching-of-players-with-trainers
2551-apply-operations-to-an-array
2698-find-the-array-concatenation-value
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2917-count-pairs-whose-sum-is-less-than-target
3437-maximum-total-damage-with-spell-casting
3683-find-the-lexicographically-largest-string-from-the-box-i

Greedy

0011-container-with-most-water
0122-best-time-to-buy-and-sell-stock-ii
0135-candy
0455-assign-cookies
0759-set-intersection-size-at-least-two
0768-partition-labels
0797-rabbits-in-forest
0917-boats-to-save-people
0979-di-string-match
1049-minimum-domino-rotations-for-equal-row
1262-greatest-sum-divisible-by-three
1382-balance-a-binary-search-tree
1407-group-the-people-given-the-group-size-they-belong-to
1448-maximum-69-number
1478-maximum-number-of-events-that-can-be-attended
1502-construct-k-palindrome-strings
1503-reducing-dishes
1529-max-difference-you-can-get-from-changing-an-integer
1700-minimum-time-to-make-rope-colorful
1818-maximum-score-from-removing-substrings
1834-minimum-number-of-people-to-teach
1877-minimize-maximum-pair-sum-in-array
1917-maximum-average-pass-ratio
1975-maximum-matrix-sum
2140-longest-subsequence-repeated-k-times
2180-maximum-number-of-tasks-you-can-assign
2221-check-if-a-parentheses-string-can-be-valid
2237-longest-palindrome-by-concatenating-two-letter-words
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2456-construct-smallest-number-from-di-string
2497-maximum-matching-of-players-with-trainers
2509-minimize-xor
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2661-smallest-missing-non-negative-integer-after-operations
2681-put-marbles-in-bags
2689-rearranging-fruits
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
2730-maximum-or
3001-apply-operations-to-maximize-score
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3493-maximum-number-of-operations-to-move-ones-to-the-end
3647-zero-array-transformation-iii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion

Sorting

0015-3sum
0018-4sum
0075-sort-colors
0169-majority-element
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0347-top-k-frequent-elements
0368-largest-divisible-subset
0378-kth-smallest-element-in-a-sorted-matrix
0455-assign-cookies
0594-longest-harmonious-subsequence
0645-set-mismatch
0692-top-k-frequent-words
0759-set-intersection-size-at-least-two
0761-special-binary-string
0900-reordered-power-of-2
0917-boats-to-save-people
1200-minimum-absolute-difference
1262-greatest-sum-divisible-by-three
1306-minimum-absolute-difference
1478-maximum-number-of-events-that-can-be-attended
1503-reducing-dishes
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
1877-minimize-maximum-pair-sum-in-array
2054-two-best-non-overlapping-events
2092-find-all-people-with-secret
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2274-keep-multiplying-found-values-by-two
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2681-put-marbles-in-bags
2689-rearranging-fruits
2699-count-the-number-of-fair-pairs
2888-minimum-index-of-a-valid-split
2917-count-pairs-whose-sum-is-less-than-target
3001-apply-operations-to-maximize-score
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3219-make-lexicographically-smallest-array-by-swapping-elements
3241-divide-array-into-arrays-with-max-difference
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3430-count-days-without-meetings
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3606-coupon-code-validator
3622-maximum-frequency-of-an-element-after-performing-operations-i
3634-minimum-removals-to-balance-array
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3647-zero-array-transformation-iii
3657-check-if-grid-can-be-cut-into-sections
3748-sort-matrix-by-diagonals
3884-minimum-absolute-difference-in-sliding-submatrix

String

0003-longest-substring-without-repeating-characters
0006-zigzag-conversion
0008-string-to-integer-atoi
0038-count-and-say
0067-add-binary
0072-edit-distance
0139-word-break
0257-binary-tree-paths
0474-ones-and-zeroes
0516-longest-palindromic-subsequence
0583-delete-operation-for-two-strings
0692-top-k-frequent-words
0696-count-binary-substrings
0761-special-binary-string
0768-partition-labels
0851-goat-latin
0868-push-dominoes
0944-delete-columns-to-make-sorted
0952-word-subsets
0960-delete-columns-to-make-sorted-iii
0979-di-string-match
1006-vowel-spellchecker
1058-lexicographically-smallest-equivalent-string
1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1205-defanging-an-ip-address
1264-maximum-number-of-words-you-can-type
1302-delete-characters-to-make-fancy-string
1350-remove-sub-folders-from-the-filesystem
1460-number-of-substrings-containing-all-three-characters
1502-construct-k-palindrome-strings
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1636-number-of-substrings-with-only-1s
1653-minimum-deletions-to-make-string-balanced
1700-minimum-time-to-make-rope-colorful
1818-maximum-score-from-removing-substrings
1915-check-if-one-string-swap-can-make-strings-equal
1930-unique-length-3-palindromic-subsequences
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2079-delete-duplicate-folders-in-system
2107-find-unique-binary-string
2137-final-value-of-variable-after-performing-operations
2140-longest-subsequence-repeated-k-times
2211-count-collisions-on-a-road
2220-find-all-possible-recipes-from-given-supplies
2221-check-if-a-parentheses-string-can-be-valid
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2346-largest-3-same-digit-number-in-string
2395-longest-binary-subsequence-less-than-or-equal-to-k
2429-design-a-food-rating-system
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2470-removing-stars-from-a-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2691-count-vowel-strings-in-ranges
2881-split-strings-by-separator
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3194-find-words-containing-character
3233-maximize-the-number-of-partitions-after-operations
3243-count-the-number-of-powerful-integers
3309-count-prefix-and-suffix-pairs-i
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits
3453-generate-binary-strings-without-adjacent-zeros
3455-minimum-length-of-string-after-operations
3462-vowels-game-in-a-string
3479-count-the-number-of-substrings-with-dominant-ones
3493-maximum-number-of-operations-to-move-ones-to-the-end
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3606-coupon-code-validator
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3683-find-the-lexicographically-largest-string-from-the-box-i
3707-find-the-most-common-response
3714-longest-balanced-substring-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3761-maximum-difference-between-even-and-odd-frequency-ii
3872-find-most-frequent-vowel-and-consonant

Prefix Sum

0238-product-of-array-except-self
0303-range-sum-query-immutable
0523-continuous-subarray-sum
0560-subarray-sum-equals-k
0724-find-pivot-index
1016-subarray-sums-divisible-by-k
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1477-product-of-the-last-k-numbers
1537-maximum-score-after-splitting-a-string
1538-maximum-points-you-can-obtain-from-cards
1590-make-sum-divisible-by-p
1631-number-of-sub-arrays-with-odd-sum
1694-make-sum-divisible-by-p
1930-unique-length-3-palindromic-subsequences
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2229-maximum-fruits-harvested-after-at-most-k-steps
2249-count-the-hidden-sequences
2358-number-of-ways-to-split-array
2394-count-subarrays-with-score-less-than-k
2529-range-product-queries-of-powers
2625-increment-submatrices-by-one
2691-count-vowel-strings-in-ranges
2730-maximum-or
2915-count-of-interesting-subarrays
3034-points-that-intersect-with-cars
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3578-count-partitions-with-max-min-difference-at-most-k
3618-find-the-original-typed-string-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3639-zero-array-transformation-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3652-best-time-to-buy-and-sell-stock-using-strategy
3714-longest-balanced-substring-ii
3721-longest-balanced-subarray-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair
3794-find-the-minimum-amount-of-time-to-brew-potions

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0037-sudoku-solver
0073-set-matrix-zeroes
0128-longest-consecutive-sequence
0139-word-break
0169-majority-element
0229-majority-element-ii
0347-top-k-frequent-elements
0496-next-greater-element-i
0523-continuous-subarray-sum
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0645-set-mismatch
0692-top-k-frequent-words
0768-partition-labels
0797-rabbits-in-forest
0865-smallest-subtree-with-all-the-deepest-nodes
0896-smallest-subtree-with-all-the-deepest-nodes
0900-reordered-power-of-2
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0952-word-subsets
1006-vowel-spellchecker
1015-smallest-integer-divisible-by-k
1016-subarray-sums-divisible-by-k
1034-subarrays-with-k-different-integers
1160-letter-tile-possibilities
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1264-maximum-number-of-words-you-can-type
1364-tuple-with-same-product
1387-find-elements-in-a-contaminated-binary-tree
1407-group-the-people-given-the-group-size-they-belong-to
1460-number-of-substrings-containing-all-three-characters
1500-count-largest-group
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1590-make-sum-divisible-by-p
1694-make-sum-divisible-by-p
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1915-check-if-one-string-swap-can-make-strings-equal
1930-unique-length-3-palindromic-subsequences
1986-largest-color-value-in-a-directed-graph
1995-finding-pairs-with-a-certain-sum
2059-unique-length-3-palindromic-subsequences
2079-delete-duplicate-folders-in-system
2107-find-unique-binary-string
2174-next-greater-numerically-balanced-number
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2274-keep-multiplying-found-values-by-two
2308-divide-array-into-equal-pairs
2429-design-a-food-rating-system
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2461-amount-of-time-for-binary-tree-to-be-infected
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2552-maximum-sum-of-distinct-subarrays-with-length-k
2626-count-the-number-of-good-subarrays
2661-smallest-missing-non-negative-integer-after-operations
2668-form-smallest-number-from-two-digit-arrays
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2707-merge-two-2d-arrays-by-summing-values
2766-find-the-prefix-common-array-of-two-arrays
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
2975-maximum-square-area-by-removing-fences-from-a-field
3034-points-that-intersect-with-cars
3227-find-missing-and-repeated-values
3360-minimum-deletions-to-make-string-k-special
3381-maximum-subarray-sum-with-length-divisible-by-k
3434-find-the-number-of-distinct-colors-among-the-balls
3437-maximum-total-damage-with-spell-casting
3445-lexicographically-minimum-string-after-removing-stars
3455-minimum-length-of-string-after-operations
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3581-the-two-sneaky-numbers-of-digitville
3592-find-x-sum-of-all-k-long-subarrays-ii
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3678-design-task-manager
3707-find-the-most-common-response
3714-longest-balanced-substring-ii
3721-longest-balanced-subarray-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3788-maximum-unique-subarray-sum-after-deletion
3863-power-grid-maintenance
3872-find-most-frequent-vowel-and-consonant

Bit Manipulation

0067-add-binary
0190-reverse-bits
0231-power-of-two
0342-power-of-four
0401-binary-watch
0645-set-mismatch
0693-binary-number-with-alternating-bits
0934-bitwise-ors-of-subarrays
1018-binary-prefix-divisible-by-5
1835-decode-xored-permutation
1930-unique-length-3-palindromic-subsequences
1993-sum-of-all-subset-xor-totals
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2400-minimum-score-after-removals-on-a-tree
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2509-minimize-xor
2529-range-product-queries-of-powers
2533-bitwise-xor-of-all-pairings
2730-maximum-or
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3233-maximize-the-number-of-partitions-after-operations
3307-find-the-maximum-sum-of-node-values
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3348-minimum-cost-walk-in-weighted-graph
3453-generate-binary-strings-without-adjacent-zeros
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3676-smallest-number-with-all-set-bits
3851-find-sum-of-array-product-of-magical-sequences

String Matching

1524-string-matching-in-an-array
3309-count-prefix-and-suffix-pairs-i

Trie

0139-word-break
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
0692-top-k-frequent-words
1350-remove-sub-folders-from-the-filesystem
2079-delete-duplicate-folders-in-system
3309-count-prefix-and-suffix-pairs-i

Rolling Hash

3309-count-prefix-and-suffix-pairs-i

Hash Function

2079-delete-duplicate-folders-in-system
3309-count-prefix-and-suffix-pairs-i

Counting

0169-majority-element
0229-majority-element-ii
0347-top-k-frequent-elements
0594-longest-harmonious-subsequence
0692-top-k-frequent-words
0900-reordered-power-of-2
1034-subarrays-with-k-different-integers
1160-letter-tile-possibilities
1227-number-of-equivalent-domino-pairs
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1915-check-if-one-string-swap-can-make-strings-equal
1986-largest-color-value-in-a-directed-graph
2140-longest-subsequence-repeated-k-times
2174-next-greater-numerically-balanced-number
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2448-count-number-of-bad-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3360-minimum-deletions-to-make-string-k-special
3437-maximum-total-damage-with-spell-casting
3455-minimum-length-of-string-after-operations
3493-maximum-number-of-operations-to-move-ones-to-the-end
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3707-find-the-most-common-response
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3872-find-most-frequent-vowel-and-consonant

Stack

0042-trapping-rain-water
0085-maximal-rectangle
0496-next-greater-element-i
0503-next-greater-element-ii
1305-number-of-visible-people-in-a-queue
1497-design-a-stack-with-increment-operation
1552-build-an-array-with-stack-operations
1628-count-submatrices-with-all-ones
1653-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
2021-remove-all-occurrences-of-a-substring
2211-count-collisions-on-a-road
2221-check-if-a-parentheses-string-can-be-valid
2236-maximum-twin-sum-of-a-linked-list
2307-replace-non-coprime-numbers-in-array
2456-construct-smallest-number-from-di-string
2470-removing-stars-from-a-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
3001-apply-operations-to-maximize-score
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and
2533-bitwise-xor-of-all-pairings
3462-vowels-game-in-a-string
3577-count-the-number-of-computer-unlocking-permutations

Divide and Conquer

0053-maximum-subarray
0169-majority-element
0190-reverse-bits
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0761-special-binary-string
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0954-maximum-sum-circular-subarray
1382-balance-a-binary-search-tree
2280-count-good-triplets-in-an-array
3721-longest-balanced-subarray-ii

Dynamic Programming

0042-trapping-rain-water
0053-maximum-subarray
0062-unique-paths
0072-edit-distance
0085-maximal-rectangle
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0139-word-break
0152-maximum-product-subarray
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0474-ones-and-zeroes
0516-longest-palindromic-subsequence
0542-01-matrix
0583-delete-operation-for-two-strings
0806-domino-and-tromino-tiling
0826-soup-servings
0867-new-21-game
0868-push-dominoes
0905-length-of-longest-fibonacci-subsequence
0909-stone-game
0934-bitwise-ors-of-subarrays
0954-maximum-sum-circular-subarray
0960-delete-columns-to-make-sorted-iii
1170-shortest-common-supersequence
1262-greatest-sum-divisible-by-three
1402-count-square-submatrices-with-all-ones
1411-number-of-ways-to-paint-n-3-grid
1503-reducing-dishes
1586-longest-subarray-of-1s-after-deleting-one-element
1628-count-submatrices-with-all-ones
1631-number-of-sub-arrays-with-odd-sum
1653-minimum-deletions-to-make-string-balanced
1700-minimum-time-to-make-rope-colorful
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
1986-largest-color-value-in-a-directed-graph
2028-the-earliest-and-latest-rounds-where-players-compete
2054-two-best-non-overlapping-events
2061-painting-a-grid-with-three-different-colors
2090-number-of-ways-to-arrive-at-destination
2110-number-of-smooth-descent-periods-of-a-stock
2262-solving-questions-with-brainpower
2267-minimum-difference-in-sums-after-removal-of-elements
2395-longest-binary-subsequence-less-than-or-equal-to-k
2408-number-of-people-aware-of-a-secret
2415-count-the-number-of-ideal-arrays
2435-paths-in-matrix-whose-sum-is-divisible-by-k
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3233-maximize-the-number-of-partitions-after-operations
3243-count-the-number-of-powerful-integers
3307-find-the-maximum-sum-of-node-values
3437-maximum-total-damage-with-spell-casting
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3578-count-partitions-with-max-min-difference-at-most-k
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3640-trionic-array-ii
3648-find-the-maximum-number-of-fruits-collected
3651-minimum-cost-path-with-teleportations
3733-length-of-longest-v-shaped-diagonal-segment
3851-find-sum-of-array-product-of-magical-sequences

Breadth-First Search

0207-course-schedule
0210-course-schedule-ii
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0542-01-matrix
0662-maximum-width-of-binary-tree
0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
0865-smallest-subtree-with-all-the-deepest-nodes
0896-smallest-subtree-with-all-the-deepest-nodes
0945-snakes-and-ladders
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1424-maximum-candies-you-can-get-from-boxes
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
1876-map-of-highest-peak
2092-find-all-people-with-secret
2461-amount-of-time-for-binary-tree-to-be-infected
2564-most-profitable-path-in-a-tree
2583-divide-nodes-into-the-maximum-number-of-groups
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3863-power-grid-maintenance

Graph

0207-course-schedule
0210-course-schedule-ii
0684-redundant-connection
0820-find-eventual-safe-states
1424-maximum-candies-you-can-get-from-boxes
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2092-find-all-people-with-secret
2201-valid-arrangement-of-pairs
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting
2438-find-closest-node-to-given-two-nodes
2564-most-profitable-path-in-a-tree
2583-divide-nodes-into-the-maximum-number-of-groups
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3863-power-grid-maintenance

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0378-kth-smallest-element-in-a-sorted-matrix
0407-trapping-rain-water-ii
0692-top-k-frequent-words
1478-maximum-number-of-events-that-can-be-attended
1479-construct-target-array-with-multiple-sums
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1917-maximum-average-pass-ratio
2054-two-best-non-overlapping-events
2204-find-subsequence-of-length-k-with-the-largest-sum
2267-minimum-difference-in-sums-after-removal-of-elements
2429-design-a-food-rating-system
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2681-put-marbles-in-bags
3332-minimum-operations-to-exceed-threshold-value-ii
3445-lexicographically-minimum-string-after-removing-stars
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3647-zero-array-transformation-iii
3650-minimum-cost-path-with-edge-reversals
3678-design-task-manager
3863-power-grid-maintenance

Matrix

0037-sudoku-solver
0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0085-maximal-rectangle
0378-kth-smallest-element-in-a-sorted-matrix
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0498-diagonal-traverse
0542-01-matrix
0854-making-a-large-island
0945-snakes-and-ladders
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1628-count-submatrices-with-all-ones
1876-map-of-highest-peak
1975-maximum-matrix-sum
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2625-increment-submatrices-by-one
2685-first-completely-painted-row-or-column
2764-maximum-number-of-fish-in-a-grid
3227-find-missing-and-repeated-values
3459-find-the-minimum-area-to-cover-all-ones-ii
3461-find-the-minimum-area-to-cover-all-ones-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3648-find-the-maximum-number-of-fruits-collected
3651-minimum-cost-path-with-teleportations
3733-length-of-longest-v-shaped-diagonal-segment
3748-sort-matrix-by-diagonals
3884-minimum-absolute-difference-in-sliding-submatrix

Shortest Path

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2090-number-of-ways-to-arrive-at-destination
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3650-minimum-cost-path-with-edge-reversals

Depth-First Search

0098-validate-binary-search-tree
0110-balanced-binary-tree
0207-course-schedule
0210-course-schedule-ii
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0386-lexicographical-numbers
0417-pacific-atlantic-water-flow
0662-maximum-width-of-binary-tree
0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
0865-smallest-subtree-with-all-the-deepest-nodes
0896-smallest-subtree-with-all-the-deepest-nodes
1093-recover-a-tree-from-preorder-traversal
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1339-maximum-product-of-splitted-binary-tree
1350-remove-sub-folders-from-the-filesystem
1382-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1558-course-schedule-iv
2092-find-all-people-with-secret
2201-valid-arrangement-of-pairs
2246-maximum-employees-to-be-invited-to-a-meeting
2400-minimum-score-after-removals-on-a-tree
2438-find-closest-node-to-given-two-nodes
2461-amount-of-time-for-binary-tree-to-be-infected
2564-most-profitable-path-in-a-tree
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
2872-maximum-number-of-k-divisible-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3863-power-grid-maintenance

Union Find

0128-longest-consecutive-sequence
0684-redundant-connection
0854-making-a-large-island
1058-lexicographically-smallest-equivalent-string
1396-count-servers-that-communicate
2092-find-all-people-with-secret
2583-divide-nodes-into-the-maximum-number-of-groups
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3219-make-lexicographically-smallest-array-by-swapping-elements
3348-minimum-cost-walk-in-weighted-graph
3863-power-grid-maintenance

Topological Sort

0207-course-schedule
0210-course-schedule-ii
0820-find-eventual-safe-states
1558-course-schedule-iv
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting

Design

0303-range-sum-query-immutable
1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
1497-design-a-stack-with-increment-operation
1995-finding-pairs-with-a-certain-sum
2429-design-a-food-rating-system
2434-design-a-number-container-system
3678-design-task-manager

Simulation

0054-spiral-matrix
0067-add-binary
0498-diagonal-traverse
1552-build-an-array-with-stack-operations
1642-water-bottles
1806-count-of-matches-in-tournament
2021-remove-all-occurrences-of-a-substring
2048-build-array-from-permutation
2137-final-value-of-variable-after-performing-operations
2211-count-collisions-on-a-road
2260-divide-a-string-into-groups-of-size-k
2265-partition-array-according-to-given-pivot
2274-keep-multiplying-found-values-by-two
2288-count-operations-to-obtain-zero
2324-find-triangular-sum-of-an-array
2408-number-of-people-aware-of-a-secret
2470-removing-stars-from-a-string
2479-meeting-rooms-iii
2551-apply-operations-to-an-array
2698-find-the-array-concatenation-value
3332-minimum-operations-to-exceed-threshold-value-ii
3336-water-bottles-ii
3379-transformed-array
3433-count-mentions-per-user
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3600-find-the-k-th-character-in-string-game-i
3790-fruits-into-baskets-ii
3794-find-the-minimum-amount-of-time-to-brew-potions

Ordered Set

2280-count-good-triplets-in-an-array
2429-design-a-food-rating-system
2434-design-a-number-container-system
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3678-design-task-manager
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3863-power-grid-maintenance

Math

0002-add-two-numbers
0007-reverse-integer
0048-rotate-image
0062-unique-paths
0066-plus-one
0067-add-binary
0069-sqrtx
0231-power-of-two
0326-power-of-three
0342-power-of-four
0368-largest-divisible-subset
0390-elimination-game
0523-continuous-subarray-sum
0679-24-game
0797-rabbits-in-forest
0826-soup-servings
0830-largest-triangle-area
0867-new-21-game
0900-reordered-power-of-2
0909-stone-game
1015-smallest-integer-divisible-by-k
1266-minimum-time-visiting-all-points
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1426-find-n-unique-integers-sum-up-to-zero
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1448-maximum-69-number
1477-product-of-the-last-k-numbers
1500-count-largest-group
1529-max-difference-you-can-get-from-changing-an-integer
1631-number-of-sub-arrays-with-odd-sum
1636-number-of-substrings-with-only-1s
1642-water-bottles
1806-count-of-matches-in-tournament
1889-check-if-number-is-a-sum-of-powers-of-three
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2110-number-of-smooth-descent-periods-of-a-stock
2160-minimum-operations-to-make-a-uni-value-grid
2174-next-greater-numerically-balanced-number
2202-sum-of-k-mirror-numbers
2288-count-operations-to-obtain-zero
2307-replace-non-coprime-numbers-in-array
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2448-count-number-of-bad-pairs
2575-minimum-cuts-to-divide-a-circle
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2661-smallest-missing-non-negative-integer-after-operations
2704-maximum-difference-by-remapping-a-digit
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2802-find-the-punishment-number-of-an-integer
2812-find-the-maximum-achievable-number
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3047-find-the-largest-area-of-square-inside-two-rectangles
3172-divisible-and-non-divisible-sums-difference
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3199-distribute-candies-among-children-i
3201-distribute-candies-among-children-ii
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3321-type-of-triangle
3336-water-bottles-ii
3433-count-mentions-per-user
3462-vowels-game-in-a-string
3512-minimum-operations-to-make-array-sum-divisible-by-k
3577-count-the-number-of-computer-unlocking-permutations
3581-the-two-sneaky-numbers-of-digitville
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3676-smallest-number-with-all-set-bits
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3754-maximum-manhattan-distance-after-k-changes
3830-find-closest-person
3851-find-sum-of-array-product-of-magical-sequences

Data Stream

1477-product-of-the-last-k-numbers

Backtracking

0037-sudoku-solver
0051-n-queens
0052-n-queens-ii
0257-binary-tree-paths
0401-binary-watch
0679-24-game
1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2174-next-greater-numerically-balanced-number
2456-construct-smallest-number-from-di-string
2802-find-the-punishment-number-of-an-integer
3453-generate-binary-strings-without-adjacent-zeros

Tree

0098-validate-binary-search-tree
0110-balanced-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0662-maximum-width-of-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
0896-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
2400-minimum-score-after-removals-on-a-tree
2461-amount-of-time-for-binary-tree-to-be-infected
2564-most-profitable-path-in-a-tree
2872-maximum-number-of-k-divisible-components
3307-find-the-maximum-sum-of-node-values
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Binary Tree

0098-validate-binary-search-tree
0110-balanced-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0662-maximum-width-of-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
0896-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
2461-amount-of-time-for-binary-tree-to-be-infected

Monotonic Stack

0042-trapping-rain-water
0085-maximal-rectangle
0496-next-greater-element-i
0503-next-greater-element-ii
1305-number-of-visible-people-in-a-queue
1628-count-submatrices-with-all-ones
3001-apply-operations-to-maximize-score

Database

0175-combine-two-tables
0181-employees-earning-more-than-their-managers
0182-duplicate-emails
0183-customers-who-never-order
0184-department-highest-salary
0586-customer-placing-the-largest-number-of-orders
1258-article-views-i
1837-daily-leads-and-partners

Enumeration

0900-reordered-power-of-2
1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2174-next-greater-numerically-balanced-number
2202-sum-of-k-mirror-numbers
2215-finding-3-digit-even-numbers
2668-form-smallest-number-from-two-digit-arrays
2975-maximum-square-area-by-removing-fences-from-a-field
2998-count-symmetric-integers
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3199-distribute-candies-among-children-i
3201-distribute-candies-among-children-ii
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3459-find-the-minimum-area-to-cover-all-ones-ii
3479-count-the-number-of-substrings-with-dominant-ones
3683-find-the-lexicographically-largest-string-from-the-box-i
3741-reschedule-meetings-for-maximum-free-time-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Geometry

0830-largest-triangle-area
1266-minimum-time-visiting-all-points
2575-minimum-cuts-to-divide-a-circle
3047-find-the-largest-area-of-square-inside-two-rectangles
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i

Linked List

0002-add-two-numbers
1411-convert-binary-number-in-a-linked-list-to-integer
2236-maximum-twin-sum-of-a-linked-list
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Recursion

0002-add-two-numbers
0231-power-of-two
0326-power-of-three
0342-power-of-four
0390-elimination-game
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Number Theory

2307-replace-non-coprime-numbers-in-array
2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3001-apply-operations-to-maximize-score

Sliding Window

0003-longest-substring-without-repeating-characters
0594-longest-harmonious-subsequence
0867-new-21-game
0940-fruit-into-baskets
1034-subarrays-with-k-different-integers
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1586-longest-subarray-of-1s-after-deleting-one-element
1813-maximum-erasure-value
2229-maximum-fruits-harvested-after-at-most-k-steps
2394-count-subarrays-with-score-less-than-k
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2552-maximum-sum-of-distinct-subarrays-with-length-k
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
2866-longest-even-odd-subarray-with-threshold
3213-count-subarrays-where-max-element-appears-at-least-k-times
3463-alternating-groups-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3479-count-the-number-of-substrings-with-dominant-ones
3483-alternating-groups-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3578-count-partitions-with-max-min-difference-at-most-k
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3634-minimum-removals-to-balance-array
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3652-best-time-to-buy-and-sell-stock-using-strategy
3743-reschedule-meetings-for-maximum-free-time-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Binary Search

0033-search-in-rotated-sorted-array
0069-sqrtx
0074-search-a-2d-matrix
0167-two-sum-ii-input-array-is-sorted
0378-kth-smallest-element-in-a-sorted-matrix
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1335-maximum-candies-allocated-to-k-children
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
2054-two-best-non-overlapping-events
2150-kth-smallest-product-of-two-sorted-arrays
2180-maximum-number-of-tasks-you-can-assign
2229-maximum-fruits-harvested-after-at-most-k-steps
2280-count-good-triplets-in-an-array
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2614-maximum-count-of-positive-integer-and-negative-integer
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
2917-count-pairs-whose-sum-is-less-than-target
3437-maximum-total-damage-with-spell-casting
3453-separate-squares-i
3454-separate-squares-ii
3619-adjacent-increasing-subarrays-detection-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3643-zero-array-transformation-ii
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Queue

0954-maximum-sum-circular-subarray
2180-maximum-number-of-tasks-you-can-assign
2408-number-of-people-aware-of-a-secret
2527-count-subarrays-with-fixed-bounds
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3578-count-partitions-with-max-min-difference-at-most-k

Combinatorics

0062-unique-paths
1993-sum-of-all-subset-xor-totals
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
3199-distribute-candies-among-children-i
3201-distribute-candies-among-children-ii
3577-count-the-number-of-computer-unlocking-permutations
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3851-find-sum-of-array-product-of-magical-sequences

Binary Search Tree

0098-validate-binary-search-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
1382-balance-a-binary-search-tree

Binary Indexed Tree

2280-count-good-triplets-in-an-array

Segment Tree

2280-count-good-triplets-in-an-array
3454-separate-squares-ii
3721-longest-balanced-subarray-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Merge Sort

2280-count-good-triplets-in-an-array

Eulerian Circuit

2201-valid-arrangement-of-pairs

Monotonic Queue

0954-maximum-sum-circular-subarray
2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
3578-count-partitions-with-max-min-difference-at-most-k

Game Theory

0909-stone-game
3462-vowels-game-in-a-string

Memoization

0139-word-break
1986-largest-color-value-in-a-directed-graph
2028-the-earliest-and-latest-rounds-where-players-compete
2395-longest-binary-subsequence-less-than-or-equal-to-k
3733-length-of-longest-v-shaped-diagonal-segment

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Bucket Sort

0347-top-k-frequent-elements
0692-top-k-frequent-words

Probability and Statistics

0826-soup-servings
0867-new-21-game

Bitmask

3233-maximize-the-number-of-partitions-after-operations
3851-find-sum-of-array-product-of-magical-sequences

Line Sweep

3454-separate-squares-ii

Doubly-Linked List

3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Graph Theory

3650-minimum-cost-path-with-edge-reversals