View Compilation Error

0_0_29051302_8682.cpp: In function 'int ISAP(int, int)':
0_0_29051302_8682.cpp:26:29: error: 'memset' was not declared in this scope
     memset(dis,0,sizeof(dis));
                             ^
0_0_29051302_8682.cpp: In function 'int main()':
0_0_29051302_8682.cpp:91:36: error: 'memset' was not declared in this scope
         memset(head,-1,sizeof(head));
                                    ^