View Compilation Error

0_0_39485400_12043.cpp: In function 'int main()':
0_0_39485400_12043.cpp:48:14: error: 'random_device' is not a member of 'std'
   48 |         std::random_device rd;
      |              ^~~~~~~~~~~~~
0_0_39485400_12043.cpp:49:14: error: 'mt19937_64' is not a member of 'std'
   49 |         std::mt19937_64 gen(rd());
      |              ^~~~~~~~~~
0_0_39485400_12043.cpp:91:47: error: 'gen' was not declared in this scope
   91 |                     hash_for_each_map[j][i] = gen();
      |                                               ^~~