View Compilation Error

0_0_25170496_13261.cpp: In function 'bool bfs(int)':
0_0_25170496_13261.cpp:22:33: error: 'memset' was not declared in this scope
  memset(steps, -1, sizeof(steps));
                                 ^
0_0_25170496_13261.cpp: In function 'int main()':
0_0_25170496_13261.cpp:83:30: error: 'memset' was not declared in this scope
   memset(map, -1, sizeof(map));
                              ^