[LeetCode] Valid Triangle Number 合法的三角形个数

【[LeetCode] Valid Triangle Number 合法的三角形个数】的更多相关文章

[LeetCode] Valid Triangle Number 合法的三角形个数

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…

LeetCode 611. Valid Triangle Number有效三角形的个数 (C++)

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…

LeetCode Valid Triangle Number

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…

LeetCode 611. 有效三角形的个数(Valid Triangle Number)

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…

Leetcode 之 Valid Triangle Number

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,…

leetcode 611. Valid Triangle Number 、259. 3Sum Smaller(lintcode 918. 3Sum Smaller)

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…

[Swift]LeetCode611. 有效三角形的个数 | Valid Triangle Number

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…

【LeetCode】611. Valid Triangle Number 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/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…

【leetcode】Valid Triangle Number

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三角形计数

［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…

LeetCode题解之Valid Triangle Number

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(…

611. Valid Triangle Number

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. Valid Triangle Number three pointer O(n^3) -> square(binary search larget number smaller than target)

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…

[LeetCode] Valid Number 验证数字

Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true Note: It is intended for the problem statement to be ambiguous. You…

[LeetCode] Valid Phone Numbers 验证电话号码

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…

LeetCode 之 Triangle

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 from top to bottom is 11 (i…

Leetcode 137 Single Number II 仅出现一次的数字

原题地址https://leetcode.com/problems/single-number-ii/ 题目描述Given an array of integers, every element appears three times except for one. Find that single one. 给出一个整数数组,除了某个元素外所有元素都出现三次.找出仅出现一次的数字. Note: 注意: Your algorithm should have a linear runtime co…

Codeforces Round #467 (Div. 2) A. Olympiad[输入一组数,求该数列合法的子集个数]

A. Olympiad time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output The recent All-Berland Olympiad in Informatics featured n participants with each scoring a certain amount of points. As the head…

[LeetCode] 246. Strobogrammatic Number 对称数

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine if a number is strobogrammatic. The number is represented as a string. For example, the numbers "69", "…

[LeetCode] 247. Strobogrammatic Number II 对称数II

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Find all strobogrammatic numbers that are of length = n. For example,Given n = 2, return ["11","69","88","96"…

[LeetCode] 260. Single Number III 单独数 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. Example: Input: [1,2,1,3,2,5] Output: [3,5] Note: The order of the result is…

【LeetCode】673. Number of Longest Increasing Subsequence 解题报告（Python）

[LeetCode]673. Number of Longest Increasing Subsequence 解题报告(Python) 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/number-of-longest-increasing-subsequence/description/ 题目描述: Given an unsorted array of integers, find the number of longest inc…

Leetcode 202 Happy Number 弗洛伊德判环解循环

今天先谈下弗洛伊德判环,弗洛伊德判环原来是在一个圈内有两人跑步,同时起跑,一人的速度是另一人的两倍,则那个人能在下一圈追上另一个人,弗洛伊德判环能解数字会循环出现的题,比如说判断一个链表是不是循环链表.在程序中具体表现为 one = change(one); //一倍速度 two = change(change(two));//两倍速度即一倍速度的人调用生成函数change一次,两倍速度的人调用生成函数change两次. Leetcode 202 Happy Number 就是这样一道简单的题…

[Usaco2010 OPen]Triangle Counting 数三角形

[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…

bzoj 1914: [Usaco2010 OPen]Triangle Counting 数三角形容斥

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…

[bzoj1914] [Usaco2010 OPen]Triangle Counting 数三角形

跑去看了黄学长的题解.. 第一次听说级角排序= =因为一直见计算几何就跑= = 级角排序就是按原点和点连起来的边与x轴正半轴构成的角的角度排序...排序完效果就是逆时针旋转地枚举每个点. 要求的是覆盖原点的三角形个数..黄金三角形各有各的姿势,但是没覆盖原点的三角形都是一个德行= =.如果一个三角形没覆盖到原点的话那么原点与三个顶点连线所跨的角度<180度..所以如果两个点与原点连线的夹角<180度的话,那么它俩可以和它们中间的点组合成不覆盖原点的三角形... 总时间复杂度O(nlogn…

leetcode 136 Single Number, 260 Single Number III

leetcode 136. 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 memory? 解题思路: 如果以线性复杂度和…

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