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…

Description https://leetcode.com/problems/word-search-ii/ Given a 2D board and a list of words from the dictionary, find all words in the board.…

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…

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…

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…

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…