ACM STEP 1.1.8 A+B for Input-Output Practice (VIII)

#include <iostream>using namespace std;int main(int argc, const char * argv[]){    int n,k,sum,f=0,a;    cin >>n;    while(n--)    {        if(f)        {            cout <<endl;        }        cin >>k;        sum=0;        while(k--)        {            cin >>a;            sum+=a;        }        cout <<sum<<endl;        f=1;    }    return 0;}