Вопрос о логике (статус выхода -1)

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Всем привет!

Я не понимаю, почему он сказал статус выхода -1?

Любой может помочь. Большое вам спасибо !

Что я уже пробовал:

#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;
int main() {
  vector<string>name {"Johnny", "Wiliam", "Joe", "Maria", "Luis"};
  int size_test = 4;
  double score[5][size_test];
  for (int i = 0; i < name.size(); i++) {
    cout << "Student " << i + 1 << ": " << name[i] << ": " << "\n";
    for (int j = 0; j < size_test; j++) {
      cout <<  "Score for test #" << j + 1 << ":";
      cin >> score[i][j];
    }
    cout << "\n";
  }
  vector<double>total;
  for (int i = 0; i < name.size(); i++) {
    double temp_total = 0;
    for (int j = 0; j < size_test; j++) {
      temp_total += score[i][j];
    }
    total.push_back(temp_total);
  }
  
  vector<double>subtotal;
  for (int i = 0; i < name.size(); i++) {
    double lowest = score[i][0];
    for (int j = 1; j < size_test; i++) {
      if (score[i][j] < lowest) {
        lowest = score[i][j];
      }
    }
    double temp_subtotal = total[i] - lowest;
    subtotal.push_back(temp_subtotal);
  }
  
  vector<double>average;
  for (int i = 0; i < name.size(); i++) {
    double temp_average = static_cast<double>(subtotal[i] * 1.0) / 
                                  (double)((size_test - 1) * 1.0);
    average.push_back(temp_average);
  }
  vector<char>grade;
  for (int i = 0; i < name.size(); i++) {
    char temp_grade = ' ';
    if (average[i] >= 90) {
      temp_grade = 'A';
    }
    else if (average[i] >= 80 && average[i] < 90) {
      temp_grade = 'B';
    }
    else if (average[i] >= 70 && average[i] < 80) {
      temp_grade = 'C';
    }
    else if (average[i] >= 60 && average[i] < 70) {
      temp_grade = 'D';
    }
    else if (average[i] < 60) {
      temp_grade = 'F';
    }
    grade.push_back(temp_grade);
  }
  cout << "\n";
  cout << setprecision(2) << fixed << showpoint;
  for (int i = 0; i < name.size(); i++) {
    cout << name[i] << ":" << "\n";
    cout << "\t" << "The average score is " << average[i] << "\n";
    cout << "\t" << "The grade is " << grade[i] << "\n";
  }
}

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