View Compilation Error

0_0_20487810_3940.cpp: In function 'bool BFS()':
0_0_20487810_3940.cpp:56:32: error: 'memset' was not declared in this scope
     memset(deep,-1,sizeof(deep));
                                ^
0_0_20487810_3940.cpp: In function 'int main()':
0_0_20487810_3940.cpp:125:34: error: 'memset' was not declared in this scope
         memset(cur,-1,sizeof(cur));
                                  ^