［抄题］: Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomer…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between iand j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs. Y…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance betweeni and j equals the distance between iand k (the order of the tuple matters). Find the number of boomerangs. Yo…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between iand j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs. Y…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between iand j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs. Y…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs.…

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 日期 [LeetCode] 题目地址:https://leetcode.com/problems/number-of-boomerangs/ Difficulty: Easy 题目描述 Given n points in the plane that are all pairwise distinct, a "boomerang" is a…

给定平面上 n 对不同的点,“回旋镖” 是由点表示的元组 (i, j, k) ,其中 i 和 j 之间的距离和 i 和 k 之间的距离相等(需要考虑元组的顺序).找到所有回旋镖的数量.你可以假设 n 最大为 500,所有点的坐标在闭区间 [-10000, 10000] 中.示例:输入:[[0,0],[1,0],[2,0]]输出:2解释:两个回旋镖为 [[1,0],[0,0],[2,0]] 和 [[1,0],[2,0],[0,0]]详见:https://leetcode.com/problems/…

题目如下: 解题思路:我首先用来时间复杂度是O(n^3)的解法,会判定为超时:后来尝试O(n^2)的解法,可以被AC.对于任意一个点,我们都可以计算出它与其余点的距离,使用一个字典保存每个距离的点的数量,例如dic[2] = 4,表示与该点距离为2的点有四个,那么这四个点任意选两个点就可以和当前点组成Boomerang,根据排列的原理,一共有4*3种方式.依次类推,进而求出当前点与所有不同距离的点组成的Boomerang的数量,最后求出所有点的Boomerang的和. 代码如下: class S…

要求 给出平面上n个点,寻找存在多少点构成的三元组(i j k),使得 i j 两点的距离等于 i k 两点的距离 n 最多为500,所有点坐标范围在[-10000, 10000]之间 示例 [[0,0],[1,0],[2,0]] 2 思路 对于每个点i,遍历其余点到i的距离(时间n2,空间n) 查找表记录其他点到 i 的<距离,频次> 对于每个距离,满足条件的三元组个数为:频次 x (频次-1) 求距离时用平方,防止浮点数误差 最长距离,2000^2+2000^2,32位整型不越界 实现 用…

447. Number of Boomerangs Easy Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters).…

问题 该文章的最新版本已迁移至个人博客[比特飞],单击链接 https://www.byteflying.com/archives/3792 访问. 给定平面上 n 对不同的点,"回旋镖" 是由点表示的元组 (i, j, k) ,其中 i 和 j 之间的距离和 i 和 k 之间的距离相等(需要考虑元组的顺序). 找到所有回旋镖的数量.你可以假设 n 最大为 500,所有点的坐标在闭区间 [-10000, 10000] 中. 输入:[[0,0],[1,0],[2,0]] 输出:2 解释:…

Description Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k(the order of the tuple matters). Find the number of b…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs.…

问题: Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?   Single Number I 升级版,一个数组中其它数出现了…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs.…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs.…

LeetCode--Number of Boomerangs Question Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple m…

问题描述: Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and jequals the distance between i and k (the order of the tuple matters). Find the number of boomera…

The Number of Palindromes Problem Description Now, you are given a string S. We want to know how many distinct substring of S which is palindrome. Input The first line of the input contains a single integer T(T<=20), which indicates number of test ca…

136. Single Number 除了一个数字,其他数字都出现了两遍. 用亦或解决,亦或的特点:1.相同的数结果为0,不同的数结果为1 2.与自己亦或为0,与0亦或为原来的数 class Solution { public: int singleNumber(vector<int>& nums) { if(nums.empty()) ; ; ;i < nums.size();i++) res ^= nums[i]; return res; } }; 137. Single N…

Give Me the Number Time Limit: 2 Seconds      Memory Limit: 65536 KB Numbers in English are written down in the following way (only numbers less than 109 are considered). Number abc,def,ghi is written as "[abc] million [def] thousand [ghi]". Her…

这是悦乐书的第231次更新,第244篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第98题(顺位题号是447).给定平面中的n个点都是成对不同的,"回旋镖"是点(i,j,k)的元组,使得i和j之间的距离等于i和k之间的距离(元组的顺序很重要)).找到回旋镖的数量.例如: 输入:[[0,0],[1,0],[2,0] 输出:2 说明:两个回旋镖是[[1,0],[0,0],[2,0]]和[[1,0],[2,0],[0,0]] 您可以假设n最多为500,点的坐标都…

题目传送门 传送点I 传送点II 传送点III 题目大意 给定一颗有$n$个点的树,$i$号点的权值是$2^{i}$要求删去$k$个点,使得剩下的点仍然连通,并且总权值和最大,问删去的所有点的编号. 其实这道题和虚树没有太大的关系,我只是提一下而已. 因为点的权值很特殊,所以相当于要求剩下序列(从大到小)的字典序最大. 然后过程就比较显然了.从大到小枚举点,判断能否保留它(计算加入它后,新的树的点数有没有超过限制).保留它是指和已经被保留的点连通. 这个相当于使得一些关键点连通,然后求出总点数.…

Minimum Inversion Number Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=1394 Description The inversion number of a given number sequence a1, a2, ..., an is the number of pairs (ai, aj) that satisfy i < j and ai…

题目描述: 给定一个包含n个整数的数组,除了一个数出现一次外所有的整数均出现三次,找出这个只出现一次的整数. 题目来源: http://oj.leetcode.com/problems/single-number-ii/ 题目分析: 对于除出现一次之外的所有的整数,其二进制表示中每一位1出现的次数是3的整数倍,将所有这些1清零,剩下的就是最终的数. 用ones记录到当前计算的变量为止,二进制1出现“1次”(mod 3 之后的 1)的数位.用twos记录到当前计算的变量为止,二进制1出现“2次”(…

给定平面上 n 对不同的点,"回旋镖" 是由点表示的元组 (i, j, k) ,其中 i 和 j 之间的距离和 i 和 k 之间的距离相等(需要考虑元组的顺序). 找到所有回旋镖的数量.你可以假设 n 最大为 500,所有点的坐标在闭区间 [-10000, 10000] 中. 示例: 输入: [[0,0],[1,0],[2,0]] 输出: 2 解释: 两个回旋镖为 [[1,0],[0,0],[2,0]] 和 [[1,0],[2,0],[0,0]] 暴力: class Solution…

Given a grid where each entry is only 0 or 1, find the number of corner rectangles. A corner rectangle is 4 distinct 1s on the grid that form an axis-aligned rectangle. Note that only the corners need to have the value 1. Also, all four 1s used must…

Given a grid where each entry is only 0 or 1, find the number of corner rectangles. A corner rectangle is 4 distinct 1s on the grid that form an axis-aligned rectangle. Note that only the corners need to have the value 1. Also, all four 1s used must…

There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the horizontal diameter. Since it's horizontal, y-coordinates don't matter and hence the x-coordinates of s…