OJ-Problems-Source/HDOJ/1678_autoAC.cpp

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#include<stdio.h>
#include<algorithm>
using namespace std;
bool cmp(int x,int y)
{ return x>y;
}
int main()
{ int t,n,i,sum;
int a[20005];
scanf("%d",&t);
while(t--)
{ scanf("%d",&n);sum=0;
for(i=1;i<=n;i++)
{ scanf("%d",&a[i]);
}
sort(a+1,a+n+1,cmp);
for(i=3;i<=n;i+=3)
{ sum+=a[i];
}
printf("%d\n",sum);
}
return 0;
}