View Compilation Error

0_0_20978883_29924.cpp: In function 'int SAP()':
0_0_20978883_29924.cpp:37:29: error: 'memset' was not declared in this scope
     memset(dis,0,sizeof(dis));
                             ^
0_0_20978883_29924.cpp: In function 'int main()':
0_0_20978883_29924.cpp:92:29: error: 'memset' was not declared in this scope
   memset(head,0,sizeof(head));
                             ^