这两个题几乎一样,只是说611. Valid Triangle Number满足大于条件,259. 3Sum Smaller满足小于条件,两者都是先排序,然后用双指针的方式. 611. Valid Triangle Number 判断这个数组能组成三角形的个数,利用两边之和大于第三边 https://www.cnblogs.com/grandyang/p/7053730.html 暴力方法是找所有3个数的组合,看满足条件的,时间复杂度是O(n3). 此方法时间复杂度为O(n2).先排序,然后le…

题目: Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid c…

611. Valid Triangle Number 1.Problem Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/valid-triangle-number/description/ 题目描述: Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array t…

Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid combi…

题目: Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid c…

Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid combi…

［抄题］: 给定一个整数数组,在该数组中,寻找三个数,分别代表三角形三条边的长度,问,可以寻找到多少组这样的三个数来组成三角形? [暴力解法]: 全部都用for循环 时间分析: 空间分析: ［思维问题］: 可以用两层循环:for循环中嵌套while,用过但是没意识 ［一句话思路］: ［输入量］:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入): ［画图］: ［一刷］: 用线段减法可以避免扫描多余状态 数组要先排序,提前注释中形成习惯 ［二刷］: ［三刷］: ［四…

611. 有效三角形的个数 611. Valid Triangle Number 题目描述 LeetCode LeetCode LeetCode611. Valid Triangle Number中等 Java 实现 import java.util.Arrays; class Solution { public int triangleNumber(int[] nums) { int count = 0, len = nums.length; Arrays.sort(nums); for (i…

Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid combi…

原题链接在这里:https://leetcode.com/problems/valid-triangle-number/description/ 题目: Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths…

1.题目描述 2.问题分析 暴力计算 3.代码 int triangleNumber(vector<int>& nums) { ; ) return res; ; i < nums.size() -; i++){ ; j < nums.size()-; j++){ ; k < nums.size(); k++){ if( isTri(nums[i], nums[j], nums[k]) ) res ++; } } } return res; } bool isTri(…

Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid combi…

Validate if a given string can be interpreted as a decimal number. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true" -90e3   " => true" 1e…

Validate if a given string can be interpreted as a decimal number. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true" -90e3   " => true" 1e…

Problem Link: http://oj.leetcode.com/problems/triangle/ Let R[][] be a 2D array where R[i][j] (j <= i) is the minimum sum of the path from triangle[0][0] to tirangle[i][j]. We initialize R[0][0] = triangle[0][0], and update R[][] from i = 1 to n-1: R…

分析 难度 易 来源 https://leetcode.com/problems/valid-phone-numbers/ 题目 Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may assume that a valid phone number m…

[LeetCode]120. Triangle 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址https://leetcode.com/problems/triangle/description/ 题目描述: Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjac…

[LeetCode]306. Additive Number 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/additive-number/description/ 题目描述: Additive number is a string whose digits can form additive se…

第一种方法,用栈实现,最容易想到,也比较容易实现,每次碰到‘)’时update max_len,由于要保存之前的‘(’的index,所以space complexity 是O(n) // 使用栈,时间复杂度 O(n),空间复杂度 O(n) class Solution { public: int longestValidParentheses(string s) { , last = -; stack<int> lefts; ; i < s.size(); ++i) { if (s[i]…

LeetCode: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] ] 分析:简单的模拟从第一层开始计算即可 class Solution { public: vector<vector<int> > g…

leetcode面试准备:Triangle 1 题目 Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [2], [3,4], [6,5,7], [4,1,8,3] ] The minimum path sum…

指数:[LeetCode] Leetcode 解决问题的指数 (C++/Java/Python/Sql) Github: https://github.com/illuz/leetcode 036. Valid Sudoku (Easy) 链接: 题目:https://leetcode.com/problems/valid-sudoku/ 代码(github):https://github.com/illuz/leetcode 题意: 推断一个数独是否有效. 有效的数独不强求有解. 分析: 仅仅…

LeetCode:36. Valid Sudoku,数独是否有效 : 题目: LeetCode:36. Valid Sudoku 描述: Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are filled with the character '.'. A partiall…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 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 a…

版权声明: 本文为博主Bravo Yeung(知乎UserName同名)的原创文章,欲转载请先私信获博主允许,转载时请附上网址 http://blog.csdn.net/lzuacm. C#版 - Leetcode 414. Third Maximum Number题解 在线提交: https://leetcode-cn.com/problems/third-maximum-number 题目描述 414. 第三大的数 给定一个非空数组,返回此数组中第三大的数.如果不存在,则返回数组中最大的数.…

Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or…

乘风破浪:LeetCode真题_009_Palindrome Number 一.前言 如何判断一个整型数字是回文呢,我们可能会转换成String来做,但是还有更简单的方法. 二.Palindrome Number 2.1 问题理解 2.2 问题分析和解答 通过题意我们知道不使用String来作答,因此我们想到可不可以采用取整和取余的运算来解决呢,如果将整数倒过来,余数乘以10加上更高位的数字,这样得到的数字如果和原来的数字相等,并且不是负数,那么就是回文的.这是我们的想法,但是是否有更好的方法呢…

Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parenthesis '(' must have a corresponding right parenthesi…

Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Input: "aba" Output: True Example 2: Input: "abca" Output: True Explanation: You could delete the character 'c'. N…