James Pan

原题网址：https://leetcode.com/problems/nim-game/ You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 to 3 ston

原题网址：https://leetcode.com/problems/flip-game/ You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take

原题网址：https://leetcode.com/problems/flip-game-ii/ You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend t

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/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/guess-number-higher-or-lower-ii/ We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Ev