HDU 1096 A+B for Input-Output Practice (VIII)

#include <iostream>

using namespace std;

int main(){
    int n,sum,m,j,k;
    cin>>m;

    while(m--){
            cin>>n;
            sum = 0;

        for(j=0;j<n;j++){
            cin>>k;
            sum+=k;
    }
        cout<<sum<<endl;
        if(m!=0)
        cout<<endl;

    }

    return 0;
}