Median---ZOJ

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=4322

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<vector>
#include<cmath>
#include<stdlib.h>
#include<iomanip>
#include<list>
#include<deque>
#include<map>
#include <stdio.h>
#include <queue>

#define maxn 10000+5
#define ull unsigned long long
#define ll long long
#define reP(i,n) for(i=1;i<=n;i++)
#define rep(i,n) for(i=0;i<n;i++)
#define cle(a) memset(a,0,sizeof(a))
#define mod 90001
#define PI 3.141592657

const ull inf = 1LL << 61;
const double eps=1e-5;

using namespace std;

bool cmp(int a,int b){
    return a>b;
}
double a[505];
int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int t,n;
    cin>>t;
    while(t--)
    {
       scanf("%d",&n);
        for(int i=1;i<=n;i++)
            scanf("%lf",&a[i]);
        sort(a+1,a+1+n);
        if(n%2!=0)printf("%.3lf\n",a[n/2+1]);
        else
            {
                double t=(a[n/2]+a[n/2+1])/2;
                printf("%.3lf\n",t);
        }
    }
    return 0;
}

   

    

   

主要练习C语言输入输出

1 printf输出float和double都可以用%f，double还可以用%lf。
2 scanf输入float用%f，double输入用%lf，不能混用。