Implemented Backtracking-3

[johar-inderpreet]

Implemented Backtracking-3

[super30admin]

• NQueens: The solution is mostly correct, but the early return for n < 4 is unnecessary. The problem should handle all n >= 1, even if some cases have no solutions. This makes the solution more general and correct for all inputs.
• WordSearch: The solution is well-implemented and efficient. One minor improvement could be to use a visited matrix instead of modifying the board, but this is a trade-off between space and time complexity.
• Both solutions are well-structured and readable. Good use of helper methods and descriptive variable names.