Description There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie on these points. In other words, find the number of 4-element subsets of these points that can be written a…
1058 - Parallelogram Counting PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie on these po…
1058 - Parallelogram Counting There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie on these points. In other words, find the number of 4-element subsets of these points tha…
1148 - Mad Counting PDF (English) Statistics Forum Time Limit: 0.5 second(s) Memory Limit: 32 MB Mob was hijacked by the mayor of the Town "TruthTown". Mayor wants Mob to count the total population of the town. Now the naive approach to this p…
链接: https://vjudge.net/problem/LightOJ-1058 题意: There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie on these points. In other words, find the number of 4-element subsets o…
题意: 简单的就组合数 C(m,n): 数据多,大, 要预处理: #include<bits/stdc++.h> using namespace std; typedef long long LL; const int maxn = 1e6 + 2; const LL MOD = 1000003; LL Pow_Mod(LL a, LL n) { LL ret = 1; while(n) { if(n & 1) ret = ret * a % MOD; n >>=1; a…
Parallelogram Counting Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 5749 Accepted: 1934 Description There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie o…
