Uri 1023

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pb push_back
#define p_b pop_back
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int c = 0;
    while(true){
        c++;
        int n, vol = 0, tot = 0;
        cin >> n;
        if(n == 0){
            break;
        }
        map<int, int> m;
        for(int i = 0; i < n; i++){
            int k, v;
            cin >> k >> v;
            m[v/k] += k;
            vol += v;
            tot += k;
        }

        cout << "Cidade# " << c << ":\n";
        for(auto i = m.begin(); i != m.end(); i++){
            cout << i->second << "-" << i->first << " ";
        }

        double av = 1.0*vol/tot;

        cout << "\nConsumo medio: " << fixed << setprecision(2) << av << " m3\n";
        cout << "\n";
    }
    return 0;
}