[Atcoder Grand Contest 001] Tutorial

Link:

AGC001 传送门

A:

……

#include <bits/stdc++.h>

using namespace std;
long long res=0;
int n,dat[500];

int main()
{
    scanf("%d",&n);
    for(int i=1;i<=2*n;i++) scanf("%d",&dat[i]);
    sort(dat+1,dat+2*n+1);
    for(int i=1;i<=2*n;i+=2) res+=dat[i];
    printf("%lld",res);
    return 0;
}

Problem A