View Compilation Error

0_0_36590860_5303.cpp: In function 'int bfs()':
0_0_36590860_5303.cpp:27:28: error: 'memset' was not declared in this scope
  memset(dis, 0, sizeof(dis));
                            ^
0_0_36590860_5303.cpp: In function 'int main()':
0_0_36590860_5303.cpp:68:26: error: 'memset' was not declared in this scope
   memset(h, -1, sizeof(h));
                          ^