View Compilation Error

0_0_22308928_30028.cpp: In function 'void tarjan_init()':
0_0_22308928_30028.cpp:60:39: error: 'memset' was not declared in this scope
  memset(inStack, false, sizeof inStack);
                                       ^
0_0_22308928_30028.cpp: In function 'void edge_init()':
0_0_22308928_30028.cpp:66:30: error: 'memset' was not declared in this scope
  memset(head, -1, sizeof head);
                              ^
0_0_22308928_30028.cpp: In function 'int main()':
0_0_22308928_30028.cpp:132:31: error: 'memset' was not declared in this scope
   memset(vis, true, sizeof vis);
                               ^