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…

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…

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,…

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…

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…

［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…

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…

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(…

LeetCode:有效三角形的个数[611] 题目描述 给定一个包含非负整数的数组,你的任务是统计其中可以组成三角形三条边的三元组个数. 示例 1: 输入: [2,2,3,4] 输出: 3 解释: 有效的组合是: 2,3,4 (使用第一个 2) 2,3,4 (使用第二个 2) 2,2,3 注意: 数组长度不超过1000. 数组里整数的范围为 [0, 1000] 题目分析 Java题解 class Solution { public int triangleNumber(int[] nums) {…

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…

611. 有效三角形的个数 给定一个包含非负整数的数组,你的任务是统计其中可以组成三角形三条边的三元组个数. 示例 1: 输入: [2,2,3,4] 输出: 3 解释: 有效的组合是: 2,3,4 (使用第一个 2) 2,3,4 (使用第二个 2) 2,2,3 注意: 数组长度不超过1000. 数组里整数的范围为 [0, 1000]. class Solution { public int triangleNumber(int[] nums) { Arrays.sort(nums); int r…

有效三角形的个数 给定一个包含非负整数的数组,你的任务是统计其中可以组成三角形三条边的三元组个数. 示例 1: 输入: [2,2,3,4] 输出: 3 解释: 有效的组合是: 2,3,4 (使用第一个 2) 2,3,4 (使用第二个 2) 2,2,3 注意: 数组长度不超过1000. 数组里整数的范围为 [0, 1000]. 思路 我们都知道,要想构成三角形,只需三角形中两条最短边之和大于最长边即可. 基于这样的原理,我们可以先将数组从小到大进行排序.将数组排序后,我们可以这样想,固定某一个数,…

[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…

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…

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…

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]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]…

[Usaco2010 OPen]Triangle Counting 数三角形 Time Limit: 10 Sec  Memory Limit: 64 MBSubmit: 394  Solved: 198[Submit][Status][Discuss] Description 在一只大灰狼偷偷潜入Farmer Don的牛群被群牛发现后,贝西现在不得不履行着她站岗的职责.从她的守卫塔向下瞭望简直就是一件烦透了的事情.她决定做一些开发智力的小练习,防止她睡着了.想象牧场是一个X,Y平面的网格.她将…

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…

1914: [Usaco2010 OPen]Triangle Counting 数三角形 Time Limit: 10 Sec  Memory Limit: 64 MBSubmit: 272  Solved: 143[Submit][Status] Description 在 一只大灰狼偷偷潜入Farmer Don的牛群被群牛发现后,贝西现在不得不履行着她站岗的职责.从她的守卫塔向下瞭望简直就是一件烦透了的事情.她决定做一些开发智力的小练习,防止她睡 着了.想象牧场是一个X,Y平面的网格.她将N…

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…