UVA 10300-Ecological Premium

#include<iostream>#include<cstdio>#include<cmath>typedef long long ll;using namespace std;int main(){   int n,size,num,value,f;    ll sum;    cin>>n;    while(n--)    {   cin>>f;        sum=0;        for(int i=0;i<f;i++)           {            cin>>size>>num>>value;        sum+=size*value;           }           cout<<sum<<endl;    }    return 0;}