View Compilation Error

0_0_36951771_17786.cpp: In function 'bool BFS(int, int)':
0_0_36951771_17786.cpp:262:29: error: 'memset' was not declared in this scope
   memset(vis, 0, sizeof(vis));
                             ^
0_0_36951771_17786.cpp: In function 'int main()':
0_0_36951771_17786.cpp:370:31: error: 'memset' was not declared in this scope
     memset(deg, 0, sizeof(deg));
                               ^