View Compilation Error

0_0_24437294_1628.cpp: In function 'int h()':
0_0_24437294_1628.cpp:43:33: error: 'memset' was not declared in this scope
     memset(visit,0,sizeof(visit));
                                 ^
0_0_24437294_1628.cpp: In function 'int main()':
0_0_24437294_1628.cpp:93:24: error: 'memset' was not declared in this scope
   memset(H,-1,sizeof(H));
                        ^