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Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidateswhere the candidate numbers sum to target.

39. Combination Sum

Posted on 2024-12-20 Edited on 2025-02-14 In Leetcode

39. Combination Sum

Description

Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. You may return the combinations in any order .

36. Valid Sudoku

Posted on 2024-12-20 Edited on 2025-02-14 In Leetcode

36. Valid Sudoku

Description

Determine if a9 x 9 Sudoku board is valid.Only the filled cells need to be validatedaccording to the following rules:

22. Generate Parentheses

Posted on 2024-12-19 Edited on 2025-02-14 In Leetcode

22. Generate Parentheses

Description

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.

17. Letter Combinations of a Phone Number

Posted on 2024-12-19 Edited on 2025-02-14 In Leetcode

17. Letter Combinations of a Phone Number

Description

Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order .

994. Rotting Oranges

Posted on 2024-12-19 Edited on 2025-02-14 In Leetcode

994. Rotting Oranges

Description

You are given an m x n grid where each cell can have one of three values: