There are N rooms and you start in room 0.  Each room has a distinct number in 0, 1, 2, ..., N-1, and each room may have some keys to access the next room. Formally, each room i has a list of keys rooms[i], and each key rooms[i][j] is an integer in [

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. For example,Given [[0, 30],[5, 10],[15, 20]],return 2. 这道题是之前那道Meeting Rooms的拓展,那道题只让我们是

We are given a 2-dimensional grid. "." is an empty cell, "#" is a wall, "@" is the starting point, ("a", "b", ...) are keys, and ("A", "B", ...) are locks. We start at the starting poin

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. Example 1: Input: [[0, 30],[5, 10],[15, 20]] Output: 2 Example 2: Input: [[7,10],[2,4]]

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. For example,Given [[0, 30],[5, 10],[15, 20]],return 2. 252. Meeting Rooms 的拓展,同样给一个开会的区间

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. For example,Given [[0, 30],[5, 10],[15, 20]],return false. 这道题给了我们一堆会议的时间,问我们能不能同时参见所有的会议,这实际

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. For example,Given [[0, 30],[5, 10],[15, 20]],return false. 题目标签:sort 这道题目给了我们一个array的会议时间,让我们

题目: ​ 有 N 个房间,开始时你位于 0 号房间.每个房间有不同的号码:0,1,2,...,N-1,并且房间里可能有一些钥匙能使你进入下一个房间. ​ 在形式上,对于每个房间 i 都有一个钥匙列表 rooms[i],每个钥匙 rooms[i][j] 由 [0,1,...,N-1] 中的一个整数表示,其中 N = rooms.length. 钥匙 rooms[i][j] = v 可以打开编号为 v 的房间. 最初,除 0 号房间外的其余所有房间都被锁住. 你可以自由地在房间之间来回走动. 如果

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. Example 1: Input: [[0,30],[5,10],[15,20]] Output: false Example 2: Input: [[7,10],[2,4]] Outp

题目链接 864. 获取所有钥匙的最短路径 题意 给定起点,要求在最短步骤内收集完所有钥匙,遇到每把锁之前只有 有对应的钥匙才能够打开 思路 BFS+状态压缩典型题目 先确定起点和总的钥匙数目,其次难点有两处: 如何确定当前路径下已经收集好特定的钥匙 如何确定钥匙已经全部收集完成 第一个问题:可以把每一个节点的状态定义为(x,y,state),其中state为钥匙数目的二进制表示,例如现在收集'b'这把钥匙,那么state更新为2(000010),括号里面为钥匙的二进制数,如果下一轮遇到'B',

841. 钥匙和房间 知识点:图:递归 题目描述 有 N 个房间,开始时你位于 0 号房间.每个房间有不同的号码:0,1,2,...,N-1,并且房间里可能有一些钥匙能使你进入下一个房间. 在形式上,对于每个房间 i 都有一个钥匙列表 rooms[i],每个钥匙 rooms[i][j] 由 [0,1,...,N-1] 中的一个整数表示,其中 N = rooms.length. 钥匙 rooms[i][j] = v 可以打开编号为 v 的房间. 最初,除 0 号房间外的其余所有房间都被锁住. 你可

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. Example 1: Input: [[0,30],[5,10],[15,20]] Output: false Example 2: Input: [[7,10],[2,4]] Outp

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. Example 1: Input: [[0, 30],[5, 10],[15, 20]] Output: 2 Example 2: Input: [[7,10],[2,4]]

请点击页面左上角 -> Fork me on Github 或直接访问本项目Github地址:LeetCode Solution by Swift    说明:题目中含有$符号则为付费题目. 如:[Swift]LeetCode156.二叉树的上下颠倒 $ Binary Tree Upside Down 请下拉滚动条查看最新 Weekly Contest!!! Swift LeetCode 目录 | Catalog 序        号 题名Title 难度     Difficulty  两数之

There is a box protected by a password. The password is n digits, where each letter can be one of the first k digits 0, 1, ..., k-1. You can keep inputting the password, the password will automatically be matched against the last n digits entered. Fo

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. For example,Given [[0, 30],[5, 10],[15, 20]],return 2. 给定由开始和结束时间 [[s1,e1],[s2,e2],...]

There are N rooms and you start in room 0.  Each room has a distinct number in 0, 1, 2, ..., N-1, and each room may have some keys to access the next room. Formally, each room i has a list of keys rooms[i], and each key rooms[i][j] is an integer in [

We are given a 2-dimensional grid. "." is an empty cell, "#" is a wall, "@" is the starting point, ("a", "b", ...) are keys, and ("A", "B", ...) are locks. We start at the starting poin

Weekly Contest 86 A:840. 矩阵中的幻方 3 x 3 的幻方是一个填充有从 1 到 9 的不同数字的 3 x 3 矩阵,其中每行,每列以及两条对角线上的各数之和都相等. 给定一个由整数组成的 N × N 矩阵,其中有多少个 3 × 3 的 “幻方” 子矩阵?(每个子矩阵都是连续的). 直接模拟即可,本来是签到题,由于粗心,浪费了时间. class Solution { public: int numMagicSquaresInside(vector<vector<int&

There is a box protected by a password. The password is n digits, where each letter can be one of the first k digits 0, 1, ..., k-1. You can keep inputting the password, the password will automatically be matched against the last n digits entered. Fo