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原创【1004】无环图

题目：在图论中，如果一个有向图从任意顶点出发无法经过若干条边回到该点，则这个图是一个有向无环图（Directed Acyclic Graph，DAG）. 对于一个n个节点的有向图（节点编号从0到n-1），请判断其是否为有向无环图.图的节点数和边数均不多于100000.请为下面的Solution类实现解决上述问题的isDAG函数，函数参数中n为图的节点数，edges是边集，edg

2017-06-26 14:16:36 319

原创【1003】相连的1

题目：对于一个01矩阵A，求其中有多少片连成一片的1. 每个1可以和上下左右的1相连.请为下面的Solution类实现解决这一问题的函数countConnectedOnes，函数参数A为给出的01矩阵，A的行数和列数均不大于1000. 函数的返回值是问题的答案.class Solution {public:int countConnectedOnes(vector>&

2017-06-26 14:13:41 257

原创【1002】等价二叉树

题目：两个二叉树结构相同，且对应结点的值相同，我们称这两个二叉树等价.例如：以下两个二叉树等价1 1/ \ / \2 3 2 3而以下两个则不等价1 1/ \ / \2 3 3 2以下两个也不等价1 1/ \ / \2 3 2 2给出两个二叉树p和q，判断它们是否等价.p和q的结点数不多于100000，每个结点的数值在1和10

2017-06-24 00:23:01 230

原创【1001】会议安排

题目：N个会议要同时举行，参会人数分别为A[0], A[1], ..., A[N-1]. 现有M个会议室，会议室可容纳人数分别为B[0], B[1], ..., B[M-1]. 当A[i]1 请为下面的Solution类实现解决上述问题的函数assignConferenceRoom. 函数参数A和B的意义如上，返回值为最多可安排的会议数.class Solution {

2017-06-18 15:54:32 738

原创【1000】函数求值

题目：定义超级和函数F如下：F(0, n) = n，对于所有的正整数n..F(k, n) = F(k – 1, 1) + F(k – 1, 2) + … + F(k – 1, n)，对于所有的正整数k和n.请实现下面Solution类中计算F(k, n)的函数（1 class Solution {public:int F(int k, int n) {

2017-06-18 13:48:23 348

原创 8.14

题目：Prove that the following problem is NP-complete:given an undirected graph G=[V,E]and an integer k,return a clique of size k as well as an independent set of size k,provided both exist.解：将最大团问

2017-06-11 17:47:45 238

原创【55】Jump Game

题目：Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximum jump length at that position.Determ

2017-06-11 15:06:14 130

原创【394】Decode String

题目：Given an encoded string, return it's decoded string.The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. Note that k

2017-06-06 23:23:52 165

原创【547】Friend Circles

题目：There are N students in a class. Some of them are friends, while some are not. Their friendship is transitive in nature. For example, if A is a direct friend of B, and B is a direct friend of C,

2017-05-28 18:52:20 240

原创【442】Find All Duplicates in an Array

题目：Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.Find all the elements that appear twice in this array.Could you do it witho

2017-05-27 21:50:45 165

原创【268】 Missing Number

题目：Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.For example,Given nums = [0, 1, 3] return 2.Note:Your algorithm sh

2017-05-18 15:51:12 301

原创【486】 Predict the Winner

题目：Given an array of scores that are non-negative integers. Player 1 picks one of the numbers from either end of the array followed by the player 2 and then player 1 and so on. Each time a player pi

2017-05-08 01:01:04 164

原创【516】 Longest Palindromic Subsequence

题目：Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000.Example 1:Input:"bbbab"Output:4One possible longest p

2017-05-04 00:15:09 205

原创【70】Climbing Stairs

问题：You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?Note: Given n will be a

2017-04-23 18:22:40 128

原创【357】Count Numbers with Unique Digits

题目：Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x Example:Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x 思路：

2017-04-15 21:31:53 226

原创【338】Counting Bits

题目：Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and return them as an array.Example:For nu

2017-04-05 22:47:24 181

原创【406】 Queue Reconstruction by Height

题目：Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k is the number of people in front o

2017-03-26 22:21:18 152

原创【513】 Find Bottom Left Tree Value

题目：Given a binary tree, find the leftmost value in the last row of the tree.Example 1:Input:2/ \1 3Output:1Example 2: Input:1/ \2 3/ / \4 5 6/7Output:7

2017-03-19 21:00:56 163

原创【100】Same Tree && 【104】Maximum Depth of Binary Tree

题目：【100】Same TreeGiven two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical and the nodes have th

2017-03-12 22:21:19 201

原创【169】Majority Element

题目：Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.You may assume that the array is non-empty and the majority e

2017-03-05 14:51:00 196

原创【520】Detect Capital

题目：Given a word, you need to judge whether the usage of capitals in it is right or not.We define the usage of capitals in a word to be right when one of the following cases holds:All lette

2017-02-25 16:31:13 342

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