# LeetCode 200. Number of Islands

Description https://leetcode.com/problems/number-of-islands/ Given a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded…

# 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. A mapping of…

# LeetCode 90. Subsets II

Description https://leetcode.com/problems/subsets-ii/description/ Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The solution…

# LeetCode 78. Subsets

Description https://leetcode.com/problems/subsets/ Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate…

# LeetCode 39. Combination Sum

Description https://leetcode.com/problems/combination-sum/description/ Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers…

# LeetCode 40. Combination Sum II

Description https://leetcode.com/problems/combination-sum-ii/description/ Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the…