Contest1205/BVectorII.cpp

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int n, q;
  cin >> n >> q;
  std::vector<std::vector<int> > v(n);
  while (q--) {
    int op;
    cin >> op;
    if (op == 0) {
      int t, x;
      cin >> t >> x;
      v[t].push_back(x);
    } else if (op == 1) {
      int t;
      cin >> t;
      if (v[t].size() > 0) {
        for (size_t i = 0; i < v[t].size() - 1; i++) {
          cout << v[t][i] << " ";
        }
        cout << *v[t].rbegin();
      }
      cout << endl;
    } else {
      int t;
      cin >> t;
      v[t].clear();
    }
  }
}