Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths. If it is impossible to form any triangle of non-zero area, return 0. Example 1: Input: [2,1,2] Output: 5 Example 2: I…
作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 排序 日期 题目地址:https://leetcode.com/problems/largest-perimeter-triangle/ 题目描述 Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, f…
题目如下: Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths. If it is impossible to form any triangle of non-zero area, return 0. Example 1: Input: [2,1,2] Output: 5 Exampl…
Given an array of 4 digits, return the largest 24 hour time that can be made. The smallest 24 hour time is 00:00, and the largest is 23:59. Starting from 00:00, a time is larger if more time has elapsed since midnight. Return the answer as a string…
分析 好久不刷题真的思维僵化,要考虑到这样一个结论:如果递增的三个数\(x_i,x_{i+1},x_{i+2}\)不符合题意,那么最大的两边之差一定大于等于第一条边,那么任何比第一条边小的都不能成立.这样一来,递增排序,然后线性找就可以了. 代码 class Solution { public: int largestPerimeter(vector<int>& A) { int ans=0; sort(A.begin(),A.end()); for(int i=A.size()-3;…
Given an array A of integers, return the number of (contiguous, non-empty) subarrays that have a sum divisible by K. Example 1: Input: A = [4,5,0,-2,-3,1], K = 5 Output: 7 Explanation: There are 7 subarrays with a sum divisible by K = 5: [4, 5, 0, -2…
We have a list of points on the plane. Find the K closest points to the origin (0, 0). (Here, the distance between two points on a plane is the Euclidean distance.) You may return the answer in any order. The answer is guaranteed to be unique (exce…
LeetCode Weekly Contest 8 415. Add Strings User Accepted: 765 User Tried: 822 Total Accepted: 789 Total Submissions: 1844 Difficulty: Easy Given two non-negative numbers num1 and num2 represented as string, return the sum of num1 and num2. Note: The…
leetcode weekly contest 43 leetcode649. Dota2 Senate leetcode649.Dota2 Senate 思路: 模拟规则round by round. class Solution { public: string predictPartyVictory(string senate) { int len = senate.size(); int r = 0; int d = 0; int i = 0; while(1) { if(senate[…
LeetCode Weekly Contest 23 1. Reverse String II Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there are less than k characters left, reverse all of them.…
题目要求 Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths. If it is impossible to form any triangle of non-zero area, return 0. 题目分析及思路 给定一个正整数数组,要求返回由这些数所能组成的周长最长且面积非零的三角…
Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths. If it is impossible to form any triangle of non-zero area, return 0. Example 1: Input: [2,1,2] Output: 5 Example 2: I…
Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths. If it is impossible to form any triangle of non-zero area, return 0. Example 1: Input: [2,1,2] Output: 5 Example 2: I…
链接:https://leetcode.com/contest/leetcode-weekly-contest-33/ A.Longest Harmonious Subsequence 思路:hash加查找 class Solution { public: int findLHS(vector<int>& nums) { if (nums.empty()) ; ; int len = nums.size(); unordered_map<int, int> hash(len…
闲着无聊参加了这个比赛,我刚加入战场的时候时间已经过了三分多钟,这个时候已经有20多个大佬做出了4分题,我一脸懵逼地打开第一道题 665. Non-decreasing Array My SubmissionsBack to Contest User Accepted:1054 User Tried:1755 Total Accepted:1080 Total Submissions:7519 Difficulty:Easy Given an array with n integers, y…
已经正式在实习了,好久都没有刷题了(应该有半年了吧),感觉还是不能把思维锻炼落下,所以决定每周末刷一次LeetCode. 这是第一周(菜的真实,只做了两题,还有半小时不想看了,冷~). 第一题: 965. Univalued Binary Tree A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalu…
581. Shortest Unsorted Continuous Subarray Given an integer array, you need to find one continuous subarray that if you only sort this subarray in ascending order, then the whole array will be sorted in ascending order, too. You need to find the shor…
Every email consists of a local name and a domain name, separated by the @ sign. For example, in alice@leetcode.com, alice is the local name, and leetcode.com is the domain name. Besides lowercase letters, these emails may contain '.'s or '+'s. If yo…
We stack glasses in a pyramid, where the first row has 1 glass, the second row has 2 glasses, and so on until the 100th row. Each glass holds one cup (250ml) of champagne. Then, some champagne is poured in the first glass at the top. When the top m…
1. 551. Student Attendance Record I 2. 552. Student Attendance Record II hihocode原题,https://hihocoder.com/contest/offers10/problems 直接粘贴代码. 其实这个第二题的问题挺多的,这里还是写一下分析过程. 我刚开始做的时候,考虑也是计数dp,一维记录a的个数,一维记录末尾l的个数,然后考虑转移,后来好像是因为转移情况复杂,简化为不考虑a的个数,因为a的个数只有1个,所以…
