View Compilation Error

0_0_36627610_7438.cpp: In function 'int main()':
0_0_36627610_7438.cpp:54:27: error: 'scanf_s' was not declared in this scope
   scanf_s("%d%lld", &n, &m);
                           ^
0_0_36627610_7438.cpp:11:38: error: 'memset' was not declared in this scope
 #define mem(a,b) memset(a,b,sizeof(a))
                                      ^
0_0_36627610_7438.cpp:55:3: note: in expansion of macro 'mem'
   mem(C, 0);
   ^