PRoblem Link：http://139.129.36.234/problem.php?id=1200

題目描述

輸入

輸出

樣例輸入

3456
樣例輸出
0.52.02.54.0
提示
中南大學計算機&軟件復試QQ群552889929
來源
2015年中南大學研究生復試機試題
AC code：
#include<iostream>#include<algorithm>#include<stdio.h>#include<map>#include<math.h>#include<string.h>#include<queue>#include<map>#include<vector>#include<set>#define LL long long#define exp 1e-9#define MAXN 1000010using namespace std;int main(){//	freopen("D://in.txt","r",stdin);    LL n,x,y;    LL ans;    while(scanf("%lld",&n)!=EOF)    {        ans = 0;        x = n/4;        y = n%4;        if(y<2)        	ans = 4*x*x;        else        	ans = 4*x*(x+1);        if(y==1)        	ans+=2*x-1;        else if(y==3)        	ans+=2*x+1;        if(ans&1)        	printf("%lld.5/n",ans/2);        else        	printf("%lld.0/n",ans/2);    }    return 0;}