SUbmitting Mock Q

[akshay4121]

No description provided.

[super30admin]

Strengths:

• You have implemented an optimal solution with O(n) time complexity, which is better than the brute-force O(n^2) approach.
• The logic is clear: you check for the complement and store the current element and its index in the map.

Areas for Improvement:

• Remember to import necessary classes. In this case, you need to add import java.util.HashMap; at the top of your file.
• While the problem states there is exactly one solution, it's a good habit to ensure your code is robust. However, returning an empty array is acceptable here.
• Consider removing unnecessary blank lines to make the code more concise and readable.
• You might want to add a comment explaining the approach briefly, though the code is self-explanatory.

Example of improved code:

import java.util.HashMap;

class Solution {
    public int[] twoSum(int[] nums, int target) {
        HashMap<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            int complement = target - nums[i];
            if (map.containsKey(complement)) {
                return new int[] { i, map.get(complement) };
            }
            map.put(nums[i], i);
        }
        return new int[] {};
    }
}