View Compilation Error

0_0_38700585_28588.cpp: In function 'void solve()':
0_0_38700585_28588.cpp:45:5: error: 'cin' was not declared in this scope
   45 |     cin >> n;
      |     ^~~
0_0_38700585_28588.cpp:46:5: error: 'memset' was not declared in this scope
   46 |     memset(h, -1, sizeof h);
      |     ^~~~~~
0_0_38700585_28588.cpp:1:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
  +++ |+#include <cstring>
    1 | 
0_0_38700585_28588.cpp:60:5: error: 'cout' was not declared in this scope
   60 |     cout << ans * qmi(n, mod - 2) % mod << endl;
      |     ^~~~
0_0_38700585_28588.cpp:60:44: error: 'endl' was not declared in this scope
   60 |     cout << ans * qmi(n, mod - 2) % mod << endl;
      |                                            ^~~~