[알고리즘] 백준 10984 - 내 학점을 구해줘

#include <iostream>
using namespace std;

int main(){
    int T;
    cin >> T;
    
    cout << fixed;
    cout.precision(1);
    
    while(T--){
        int N, C=0;
        double G=0.0;
        
        cin >> N;
        for(int i=0; i<N; i++){
            int tmp;
            double d;
            cin >> tmp >> d;

            C += tmp;   
            G += d * tmp;
        }
        cout << C << " " << G / C <<"\n";
    }    
    return 0;
}