View Compilation Error

0_0_26252376_6957.cpp: In function 'void init(int)':
0_0_26252376_6957.cpp:11:27: error: 'c' was not declared in this scope
         has[i]=has[i-1]*P+c[i];
                           ^
0_0_26252376_6957.cpp: In function 'void _hash(int, int)':
0_0_26252376_6957.cpp:27:25: error: 'ans' was not declared in this scope
     if(!_insert(Now)) ++ans;
                         ^