View Compilation Error

0_0_21811294_1954.cpp: In function 'int main()':
0_0_21811294_1954.cpp:167:22: error: 'ans' was not declared in this scope
         if(!check(r))ans=l;
                      ^
0_0_21811294_1954.cpp:168:23: error: 'ans' was not declared in this scope
         printf("%d\n",ans);
                       ^