average

#include <iostream>
#include <fstream>
#include <map>
#include <iomanip>
using namespace std;
int main() {
  const int n = 21;
  map<int, int> sum, size, pass;
  int id, group, score;
  for (int i = 0; i < n; i++) sum[i] = size[i] = pass[i] = 0;
  ifstream fin("itiran.csv");
  while (fin >> id >> group >> score) {
    sum[group] += score;
    size[group]++;
    if (score > 80) pass[group]++;
  }
  for (auto& e: sum) {
    if (e.first == 0) continue;
    if (size[e.first] == 0) {
      cout << e.first << ' ' << '-' << ' ' << '-' << ' ' << '-' << endl;
      continue;
    }
    cout << e.first << ' ' << size[e.first] << ' '
        << ((double) e.second) / size[e.first] << ' '
        << ((double) pass[e.first]) / size[e.first] << endl;
  }
}