James Pan

原题网址：https://leetcode.com/problems/android-unlock-patterns/Given an Android 3x3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the total number of unlock patterns of the An

原题网址：https://leetcode.com/problems/dungeon-game/The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists of M x N rooms laid ou

原题网址：https://leetcode.com/problems/valid-sudoku/Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are fil

原题网址：https://leetcode.com/problems/sudoku-solver/Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may assume that th

原题网址：https://leetcode.com/problems/n-queens-ii/Follow up for N-Queens problem.Now, instead outputting board configurations, return the total number of distinct solutions.方法一：深度优先搜索，使用一

原题网址：https://leetcode.com/problems/design-snake-game/Design a Snake game that is played on a device with screen size = width x height. Play the game online if you are not familiar with the gam

原题网址：https://leetcode.com/problems/design-tic-tac-toe/Design a Tic-tac-toe game that is played between two players on a n x n grid.You may assume the following rules:A move is guaranteed

原题网址：https://leetcode.com/problems/surrounded-regions/Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.A region is captured by flipping all 'O's into 'X's i

原题网址：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 an integer n, retu