View Compilation Error

0_0_18188314_3639.cpp: In function 'void manacher(char*)':
0_0_18188314_3639.cpp:34:3: error: 'ans' was not declared in this scope
   ans=max(p[i],ans);
   ^
0_0_18188314_3639.cpp:37:19: error: 'ans' was not declared in this scope
     printf("%d\n",ans-1);
                   ^