View Compilation Error

0_0_25743841_15589.cpp: In function 'int main()':
0_0_25743841_15589.cpp:103:9: error: 'cnt' was not declared in this scope
         cnt=0;
         ^
0_0_25743841_15589.cpp:104:16: error: 'head' was not declared in this scope
         memset(head,-1,sizeof(head));
                ^