2016 Multi-University Training Contest 7 1002 Balls and Boxes (数学)
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题意
一堆球,放到一堆盒子中,每个球到每个盒子的概率是一致的,求每个盒子中球数量的方差。
思路
二项分布求方差,直接上公式就好了。
代码
#include <bits/stdc++.h>using namespace std;typedef long long ll;int main(){ ll n,m; while(~scanf("%I64d %I64d",&n,&m)&& n) { ll a = n * (m-1); ll b = m * m; ll gc = __gcd(a,b); printf("%I64d/%I64d\n",a/gc,b/gc); } return 0;}
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