View Compilation Error

1_734_4392_14722.cpp: In function 'int main()':
1_734_4392_14722.cpp:48:17: error: 'time' was not declared in this scope
     srand(time(0));
                 ^
1_734_4392_14722.cpp:56:41: error: 'memset' was not declared in this scope
         memset(visit,false,sizeof(visit));
                                         ^