View Compilation Error

0_0_32393388_1238.cpp: In function 'bool bfs()':
0_0_32393388_1238.cpp:24:29: error: 'memset' was not declared in this scope
  memset(dep, -1, sizeof(dep));
                             ^
0_0_32393388_1238.cpp: In function 'int main()':
0_0_32393388_1238.cpp:75:32: error: 'memset' was not declared in this scope
   memset(head, -1, sizeof(head));
                                ^