Çàäà÷à . ×åòûðåõìåðíûé âåêòîð

#include <iostream>    

#include <vector>    

using namespace std;    

int main() {    

  int N;    

  cin >> N;    

  for(int i1 = 0; i1 < N; i1++)    

    for (int i2 = 0; i2 < N; i2++)    

      for (int i3 = 0; i3 < N; i3++)    

        for (int i4 = 0; i4 < N; i4++) {    

          int x;    

          cin >> x;    

          a[i1][i2][i3].push_back(x);    

        }    

}