string string_of_int_array(int[] arr, int len) {
  var res = "[";
  for (var i = 0; i < len; i = i + 1;) {
    res = string_cat(res, " ");
    res = string_cat(res, string_of_int(arr[i]));
  }
  res = string_cat(res, " ]\n");
  return res;
}

string pascal_triangle(int num_rows) {
  var current_row = new int[] {1};

  var result = "";

  for (var current_len = 1; current_len <= num_rows; current_len = current_len + 1;) {
    result = string_cat(result, string_of_int_array(current_row, current_len));

    var new_row = new int[current_len + 1];

    new_row[0] = current_row[0];
    for (var j = 1; j < current_len; j = j + 1;) {
      new_row[j] = current_row[j - 1] + current_row[j];
    }
    new_row[current_len] = current_row[current_len - 1];
    current_row = new_row;
  }

  return result;
}

int program(int argc, string[] argv) {
  print_string(pascal_triangle(10));
  return 0;
}