AOJ.562 寻找罗恩和赫敏

寻找罗恩和赫敏

考察点

水题

Time Mem Len Lang 0 492KB 0.42K G++

题意分析

计算1/C(n,2)的值

代码总览

/*    Title:AOJ.562    Author:pengwill    Date:2016-12-15*/#include <iostream>#include <stdio.h>using namespace std;long long get(long long m){    long long ret = m,temp = m,i = 1;    while(i--){        temp--;        ret*=temp;    }    return ret/2;}int main(){    int n;    scanf("%d",&n);    while(n--){        long long m;        scanf("%lld",&m);         m = get(m);        double t = 1.0/m;        printf("%.6f\n",t);    }    return 0;}