View Compilation Error

0_0_22147676_22133.cpp: In function 'int bfs(int, int)':
0_0_22147676_22133.cpp:16:32: error: 'memset' was not declared in this scope
     memset(dep, -1, sizeof(dep));
                                ^
0_0_22147676_22133.cpp: In function 'int main()':
0_0_22147676_22133.cpp:91:29: error: 'memset' was not declared in this scope
         memset(c,0,sizeof(c));
                             ^