题意:给你平面上n个点,问有多少条过原点的直线,使得这些点在该直线上的投影(做垂直,对应点)形成对称图形?n<=2000. 标程: #include<bits/stdc++.h> #define P pair<int,int> using namespace std; const int inf=0x3f3f3f3f; ; ; struct node{double x,y,k;int px,py;}a[N*N]; double mid_x,mid_y; int n,x[N],…

Codeforces886(Technocup2018) F Symmetric Projections You are given a set of n points on the plane. A line containing the origin is called good, if projection of the given set to this line forms a symmetric multiset of points. Find the total number of…

ACM ICPC 每个队伍必须是3个人 #include<stdio.h> #include<string.h> #include<stdlib.h> #include<vector> #include<algorithm> using namespace std; int cmp(const void * x, const void * y) { //x < y : -; } ]; int main() { #ifndef ONLINE_…

题目链接:Symmetric Tree | LeetCode OJ Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 Note: B…

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 Note:Bonus points if you could solve it b…

Event Store 2.0版本于上周发布,它带来了安全支持允许锁定Event Store和在事件流上设置访问控制列表.其主要新特性包括: HTTP和TCP之上的身份认证,包括账户管理 测试版Projections库(Event Store的查询语言)和一些尚未正式发布的变化及文档 支持通过环境变量和配置文件进行配置atom协议 可以运行在SSL之上的TCP客户端 改进了AtomPub接口,使之更好地遵守 增加了更多文档,其中包括一份入门指南 特别地,对于高可用性版本(包含相同数据的节点集群)…

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 递归解法: /** * Definition for binary tree *…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION As demands for perfor-mance increase and as the cost of microprocessors continues to drop, vendors have introduced systems with an SMP organization. The term SMP refers to…

Problem Link: https://oj.leetcode.com/problems/symmetric-tree/ To solve the problem, we can traverse the tree level by level. For each level, we construct an array of values of the length 2^depth, and check if this array is symmetric. The tree is sym…

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 /** * Definition for a binary tree node.…