摘要： 1、问题描述 Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where 阅读全文

摘要： 1、问题描述： 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, ret 阅读全文

摘要： 1、问题描述： Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbe 阅读全文

摘要： 1.拓扑排序 阅读全文