View Compilation Error

0_0_18013708_14754.cpp: In function 'void init()':
0_0_18013708_14754.cpp:19:31: error: 'memset' was not declared in this scope
     memset(head,-1,sizeof head);
                               ^
0_0_18013708_14754.cpp: In function 'int main()':
0_0_18013708_14754.cpp:63:29: error: 'strcmp' was not declared in this scope
             if(strcmp(ss,"#")==0)break;
                             ^
0_0_18013708_14754.cpp:65:31: error: 'strcmp' was not declared in this scope
             if(strcmp(ss,"SAS")==0)add(v,u,0);
                               ^