matrix6666-优快云博客

原创【leetcode】二叉树后序遍历（stack）

145. Binary Tree Postorder Traversalleetcode题目题目描述Given a binary tree, return the postorder traversal of its nodes’ values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3

2018-01-03 14:41:39 392

原创【leetcode】二叉树中序遍历（stack）

94. Binary Tree Inorder Traversalleetcode题目题目描述Given a binary tree, return the inorder traversal of its nodes’ values. For example: Given binary tree [1,null,2,3], 1 \ 2 / 3re

2018-01-03 14:09:36 557

原创【leetcode】二叉树先序遍历（stack）

144. Binary Tree Preorder Traversalleetcode题目题目描述Pick OneGiven a binary tree, return the preorder traversal of its nodes’ values. For example: Given binary tree [1,null,2,3], 1 \ 2

2018-01-03 13:56:12 307

原创【leetcode】Unique Paths II（动态规划）

63. Unique Paths IIleetcode题目题目描述Discuss Pick OneFollow up for “Unique Paths”: Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty spac

2018-01-03 13:16:54 315

原创【leetcode】Unique Paths（动态规划）

62. Unique Pathsleetcode题目描述A robot is located at the top-left corner of a m x n grid (marked ‘Start’ in the diagram below). The robot can only move either down or right at any point in time.

2018-01-03 09:34:45 320

原创【Algorithms】NP-complrte problem(exercises-8.14)

习题解答题目8.14 证明此问题是NP完全的：给定一个无向图G=(V,E)和一个整数k，求G中一个规模为k的团以及一个规模为k的独立集（假设存在）。

2018-01-03 08:48:22 226

原创【Algorithms】NP-complete problems(exersises-8.8)

题目8.8在EXACT 4SAT问题中，输入为一组子句，每个子句都恰为4个literal的析取，且每个变量最多在每个子句中出现一次。目标是求其satisfying assignment（若其确实存在）。证明 EXACT 4SAT是NP完全问题。

2018-01-03 08:24:21 326

原创【leetcode】回文串划分（DFS）

131. Palindrome Partitioningleetcode题目题目描述Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For example, gi

2017-12-13 08:05:21 274

原创【leetcode】Reverse Integer（考虑溢出问题）

7. Reverse Integerleetcode题目题目描述Given a 32-bit signed integer, reverse digits of an integer.Example 1:Input: 123 Output: 321 Example 2:Input: -123 Output: -321 Example 3:Input: 120 Output: 21Note

2017-11-22 11:33:15 286

原创【leetcode】Two Sum（unordered_map的使用）

1. Two Sumleetcode题目描述题目描述：Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solution, and y

2017-11-22 10:39:24 466

原创【leetcode】最长连续序列（unordered_map的使用）

128. Longest Consecutive Sequenceleetcode题目描述题目描述：Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given [100, 4, 200, 1, 3, 2], The lo

2017-11-22 09:16:10 797

原创【leetcode】搜索范围（二分查找升序数组target元素上下界）

34. Search for a Rangeleetcode题目描述题目描述：Given an array of integers sorted in ascending order, find the starting and ending position of a given target value. Your algorithm’s runtime complexity must be

2017-11-01 09:46:06 826

原创【leetcode】寻找两个已排序数组的中位数（类似二分）

4. Median of Two Sorted Arraysleetcode题目描述题目描述：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 shoul

2017-10-23 21:57:30 841

原创【leetcode】有重复的旋转排序数组查找（二分）

81. Search in Rotated Sorted Array IIleetcode题目描述题目描述：Follow up for “Search in Rotated Sorted Array”: What if duplicates are allowed? Would this affect the run-time complexity? How and why? Suppose

2017-09-28 13:34:29 628

原创【leetcode】在旋转排序数组中查找（二分）

33. Search in Rotated Sorted Arrayleetcode题目描述题目描述：Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).You are

2017-09-27 14:13:18 459

原创【leetcode】查找插入位置（二分）

35. Search Insert Positionleetcode题目描述题目描述：Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order. Y

2017-09-20 10:31:17 849

原创【leetcode】已排序数组去重 II

80. Remove Duplicates from Sorted Array IIleetcode题目描述题目描述：Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocate extra s

2017-09-12 21:44:02 1131

原创【leetcode】已排序数组去重

【leetcode】已排序数组去重leetcode题目描述26. Remove Duplicates from Sorted ArrayGiven a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocat

2017-09-11 17:36:02 1403

原创 Pascal triangle （杨辉三角）制表符

Description: By using two-dimensional array, write C program to display a table that represents a Pascal triangle of any size. In Pascal triangle, the first and the second rows are set to 1. Each ele

2015-12-16 00:17:30 856

原创合并字符串（动态内存申请）

Description: 合并两个字符串，每个字符串长度不小于1不超过50，主函数已经给出，在join.h头文件中完成join函数，函数原型如下：char* join(char* a, int alength, char* b, int blength)需要在join函数中动态申请内存，长度为a和b长度之和加1（因为字符串结尾有‘\0’）; 函数返回值即所动态申请内存的首地址。输入：两个字符串，

2015-12-16 00:10:36 1195

原创 eggs（递归）

Description: Erin买了不少鸡蛋，她发现一天吃不完这么多，于是决定把n个同样的鸡蛋放在m个同样的篮子里，允许有的篮子空着不放，请问共有多少种不同的放法呢？注意：2，1，1和1，2，1 是同一种分法。Input 第一行是测试数据的数目t（0 <= t <= 20）。以下每行均包含二个整数m和n，以空格分开。1<=m，n<=10。Output 对输入的每组数据m和n，用一行输出相

2015-12-16 00:05:32 456

原创 Ant（GG）

Description: 一根长度为L厘米的木棒上有N只蚂蚁，每只蚂蚁要么向左走，要么向右走，速度为1厘米/秒。当两只蚂蚁相撞时，他们会同时掉头（掉头时间不计）给出每只蚂蚁距离木棒左端的距离，问多少秒后，刚好所有蚂蚁都从木棒上掉下来。N 和 L均不超过1000输入第一行两个整数，分别是N和L接下来N行，每行先是一个字符，L或R，代表向左还是向右，然后是一个整数x，代表这个蚂蚁距离木棒左端的距离。

2015-12-15 23:58:22 411

原创挑战高楼（斐波那契非递归实现）

Description: Jeremy想要参加广州塔的垂直马拉松活动，然而Jeremy发现在爬楼梯的过程中有不同的方式：他可以一次走1级台阶，也可以一次走2级台阶。现在Jeremy准备在学校的楼梯进行练习准备，请问你可以算出他在m次爬n级台阶的时候，有多少种不同的方式吗？（利用函数进行计算，例如第n层的结果取决于第n-1和n-2层的结果）输入输出格式如下：input: mn1n2n3…nm (一

2015-12-09 15:09:38 446

原创函数与递归练习

函数与递归最大公约数阶乘

2015-12-09 15:06:39 403

原创 Bucket sort 桶排序(含EOF）

桶排序；EOF

2015-12-09 14:14:02 352

转载 sicily 1007. To and Fro（破译密码)

Description: 题目大意：Mo and Larry have devised a way of encrypting messages. They first decide secretly on the number of columns and write the message (letters only) down the columns, padding with extra

2015-12-09 13:53:25 662

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