Lesson25

#include <iostream>
#include <vector>

using namespace std;

int main() {
  int n; cin >> n;
  // Матрица смежности.
  vector<vector<bool>> matrix(n, vector<bool>(n));
  for (auto& row : matrix) {
    for (int j = 0; j < n; ++j) {
      bool x; cin >> x;
      row[j] = x;
    }
  }
  // Список смежности.
  vector<vector<int>> g(n);
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      if (matrix[i][j]) {
        g[i].push_back(j);
      }
    }
  }
  for (int u = 0; u < n; ++u) {
    cout << u + 1 << ": ";
    for (int v : g[u]) cout << v + 1 << ", ";
    cout << "\n";
  }
  return 0;
}