View Compilation Error

0_0_14710631_651.cpp: In function 'int max_flow()':
0_0_14710631_651.cpp:37:26: error: 'memset' was not declared in this scope
  memset(dis,0,sizeof(dis));
                          ^
0_0_14710631_651.cpp: In function 'int main()':
0_0_14710631_651.cpp:93:29: error: 'memset' was not declared in this scope
   memset(head,0,sizeof(head));
                             ^