燚涯-优快云博客

原创 recv函数

函数原型：int recv(int sockfd, void *buf, int len, int flags) 函数功能：用来接收远程主机通过套接字sockfd发送来的数据，并把这些数据保存到数组buf中。参数说明：（1） sockfd：建立连接的套接字（2） buf：接收到的数据保存在该数组中（3） len：数组的长度（4） flags：一般设置为0 返回值说明：> 0

2016-01-14 22:37:04 9553

原创 Hex与Double类型之间的转换

unsigned int getbitu(const unsigned char *buff, int pos, int len) {unsigned int bits=0;int i;for (i=pos;i<pos+len;i++){ bits=(bits<<1)+((buff[i/8]>>(7-i%8))&1u);}return bits;}/将十六进制的数转换成doub

2015-12-02 16:48:01 13800 2

原创 Pascal's Triangle II

Given an index k, return the kth row of the Pascal’s triangle.For example, given k = 3, Return [1,3,3,1].Note: Could you optimize your algorithm to use only O(k) extra space?int* getRow(int rowIndex,

2015-09-25 10:29:29 476

原创 Pascal's Triangle

Given numRows, generate the first numRows of Pascal’s triangle.For example, given numRows = 5, Return[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ]int** generate(int numRows, int

2015-09-24 22:32:58 442

原创杨辉三角序列的生成

void Pascal(int n) {if (n == 0) return;int** num = (int**)malloc(sizeof(int*)*n);for (int i = 0; i < n; i++) num[i] = (int*)malloc(sizeof(int)*n);for (int i = 0; i < n; i++){ for (int j

2015-09-21 21:28:04 501

原创类对象的赋值和复制

对象的赋值可以采用重载运算符的方法实现：对象名1 = 对象名2；对象的复制可以采用复制构造函数的方法实现：（1）类名对象2（对象1）（2）类名对象2 = 对象1 这两种方法调用的都是复制构造函数而不是构造函数，故需要提前声明复制构造函数；若没有声明复制构造函数，则这两种方法在编译时均能通过，但也没有调用构造函数，程序运行结束时却会调用析构函数。class myClass { p

2015-09-15 23:31:52 1859

Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-negative.char* multiply(char* num1, char* num2) {//获取字符

2015-09-15 16:50:54 282

原创 Single Number III

Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements that appear only once.For example:Given nums = [1,

2015-09-13 16:36:59 275

原创 Single Number II

Given an array of integers, every element appears three times except for one. Find that single one.Note: Your algorithm should have a linear runtime complexity. Could you implement it without using ex

2015-09-13 11:10:01 398

原创 Single Number

Given an array of integers, every element appears twice except for one. Find that single one.Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra me

2015-09-13 11:08:48 272

原创 House Robber

You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses

2015-09-07 21:25:51 96

原创求两个字符串的最长公共子串的长度

int func(char* query, char* text) {if (query == NULL || text == NULL) return 0;int len1 = strlen(query);int len2 = strlen(text);int sum = 0;int count = 0;for (int start = 0; start < len2; start

2015-09-07 20:36:58 659

原创 Jump Game

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.Determine if you are

2015-09-05 22:21:58 338

原创 Ugly Number II

Write a program to find the n-th ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12 is the sequence of the first 10 ugly

2015-09-05 18:46:26 327

原创 Ugly Number

Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it in

2015-09-05 16:39:27 333

原创 Median of Two Sorted Arrays

There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).解题思路：先求出两个数组元素个数之和numsSize，则

2015-08-27 20:22:27 344

原创 Partition List

Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.You should preserve the original relative order of the nodes in each of the

2015-08-25 11:57:11 296

原创 Linked List Cycle II

Given a linked list, return the node where the cycle begins. If there is no cycle, return null.Note: Do not modify the linked list.Follow up: Can you solve it without using extra space?解题思路：（1）用快慢指针

2015-08-25 10:41:47 305

原创 360在线笔试题：挑选镇长

题目的描述如下所示：输入输出要求如下：#include #include struct GX{int num1;//renshi ta de ren;int num2;//ta renshi de ren;};int main(void){int T;int n,m;int** guanxi;int i

2015-08-11 22:20:10 1318

原创 Reorder List

Given a singly linked list L: L0→L1→…→Ln-1→Ln, reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→…You must do this in-place without altering the nodes’ values.For example, Given {1,2,3,4}, reorder it to {1,4,2,3}

2015-08-09 13:42:42 314

原创 Majority Element II

Given an integer array of size n, find all elements that appear more than ⌊ n/3 ⌋ times. The algorithm should run in linear time and in O(1) space.解题思路：（1）定义两个大小为2数组，一个为temp[2]存储元素，一个为times[2]存储次数（

2015-08-05 16:58:16 355

原创 Lowest Common Ancestor of a Binary Search Tree

Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two

2015-07-26 22:34:54 206

原创 Reverse Nodes in k-Group

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is.You

2015-07-26 21:09:07 357

原创 Implement strStr()

即：自己实现strstr()函数 Implement strStr().Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.解题思路：求出两个函数的长度差值，即返回值index的取值范围int strStr(char* haystack,

2015-07-23 22:55:03 201

原创 Plus One

Given a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significant digit is at the head of the list.解题思路：（1）重新分配一个数组，大小为digitsS

2015-07-22 21:23:25 363

原创 Sort List

Sort a linked list in O(n log n) time using constant space complexity.解题思路：（1）将链表中的值依次取出存在一个数组中（2）对数组进行希尔排序（3）将排序后的元素放回链表中struct ListNode* sortList(struct ListNode* head) {struct ListNode* head1

2015-07-21 22:07:23 289

原创 Reverse Linked List

给定一个链表：1->2->3->NULL 反转后为：3->2->1->NULL;struct ListNode* reverseList(struct ListNode* head) { struct ListNode* pNode = head; struct ListNode* PreNode = NULL; struct ListNode* NewHead =

2015-07-21 21:32:00 313

原创 Reverse Linked List II

Reverse a linked list from position m to n. Do it in-place and in one-pass. For example: Given 1->2->3->4->5->6->NULL, m = 2 and n = 5, return 1->5->4->3->2->6->NULL. Note: Given m, n satisfy the

2015-07-21 21:28:55 273

原创 Largest Number

Given a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.Note: The result may be very large,

2015-07-21 11:48:57 318

原创 4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target.Note: Elements in a quad

2015-07-20 15:45:30 342

原创 3Sum

Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be

2015-07-20 13:40:01 432

原创 Two Sum

Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the target, where in

2015-07-19 23:18:11 271

原创 3Sum Closest

Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly

2015-07-19 22:48:19 446

原创求旋转数组的最小值

已知一个递增排序的旋转数组（没有重复的数），如{1,2,3,4,5}的一个旋转数组为{3,4,5,1,2}，求旋转数组的最小值解题思路：（1）第一个指针总是指向前面的递增数组，最终停在最大的元素上，即元素5；（2）第二个指针总是指向后面的递增数组，最终停在最小的元素上，即元素1int findMin(int* nums, int numsSize) {int start = 0;int end

2015-07-17 23:12:20 528

原创将一个链表后K个结点移到链表头

例如：给定链表： 1->2->3->4->5->NULL ； k = 2或k = 7 翻转后的结果为： 4->5->1->2->3->NULL.解题思路：（1）将单链表转换成循环链表（2）根据K值确定新链表头的位置struct ListNode* rotateRight(struct ListNode* head, int k) {if (head == NULL || k == 0)

2015-07-15 21:55:44 606

原创求一个二叉搜索树中第K个最小值

假设该颗二叉搜索树的总元素数大于等于K解题思路：用STL容器的栈来实现int kthSmallest(TreeNode* root, int k) { std::stack<TreeNode*> Stack; while (root || !Stack.empty()) { if (root) { Stack.push

2015-07-14 22:51:16 1021

原创字符串的无重复全排列

using namespace std;void function(char* pStr, char* pBegin); bool IsSwap(char* pBegin, char* pEnd);int main(void) {char str[] = "aabc";function(str,str);return 0;}//在[pBegin,pEnd]区间中是否有字符与下标为pEnd的字符

2015-07-09 16:58:49 703

原创 arm-linux-gcc交叉编译器安装说明

Arm-linux-gcc 交叉编译器安装使用说明： 1. 解压安装包：#tar xvf arm-linux-gcc-3.4.1.tar.bz2 –C / 2. 进入解压后的文件夹，将以交叉编译器版本号命名的文件夹拷贝到/usr/local/目录下，则现在的交叉编译程序集都在/usr/local/3.4.1/bin里面 3. 修改环境变量，把交叉编译器的路径加入到PATH：修改~/.ba

2015-07-04 15:00:33 593

原创求一个字符串中不带重复字母的最长substr的长度

问题描述：给出一个字符串，求该字符串的最长子字符串的长度，该子字符串没有重复的字符。例如：给定字符串“abcabca”，则返回的长度应该为3；再如给定字符串“aaaaaaaa”，则返回测长度应该为1.解题思路：用一个临时字符串来存储当前字符串的没有重复字符的子字符串 int lengthOfLongestSubstring(char* s) { if (s == NULL)

2015-07-02 22:29:35 579