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用两条边平行且相等，判断平行四边形。 把所有边转换成向量。mulitest 记录每种向量的个数，在统计#include <bits/stdc++.h> #define maxn 100005 #define INF 1e9 using namespace std; typedef long long ll;struct Node{ Node(){ } Node(int a,

原题链接 D. Magic Box time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output One day Vasya was going ho

原题链接 C. Peter and Snow Blower time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Peter got a new snow blo