LeetCode 351. Android Unlock Patterns
Description https://leetcode.com/problems/android-unlock-patterns/ Given an Android 3×3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the…
Category: Backtracking
LeetCode 212. Word Search II
Description https://leetcode.com/problems/word-search-ii/ Given an m x n board of characters and a list of strings words, return all words on the board. Each word must…
LeetCode 425. Word Squares
Description https://leetcode.com/problems/word-squares/ Given a set of words (without duplicates), find all word squares you can build from them. A sequence of words forms…
LeetCode 51. N-Queens
Description https://leetcode.com/problems/n-queens/ The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given…
LeetCode 37. Sudoku Solver
Description https://leetcode.com/problems/sort-colors/ Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the…
LeetCode 79. Word Search
Description https://leetcode.com/problems/word-search/ Given a 2D board and a word, find if the word exists in the grid. The word can…
LeetCode 22. Generate Parentheses
Description https://leetcode.com/problems/generate-parentheses/ Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. Example 1: Input: n = 3…
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…
LeetCode 90. Subsets II
Description Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The…
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…