View Compilation Error

0_0_14218663_29081.cpp: In function 'void GPS(long long int, long long int)':
0_0_14218663_29081.cpp:18:13: error: 'ans' was not declared in this scope
     if(L==0)ans=min(ans,R);
             ^
0_0_14218663_29081.cpp:23:34: error: 'ans' was not declared in this scope
         if(R+R-L-L-1<=L && R+R-L<ans)GPS(L,R+R-L);
                                  ^
0_0_14218663_29081.cpp:24:38: error: 'ans' was not declared in this scope
         if(R+R-L+1-L-1<=L && R+R-L+1<ans)GPS(L,R+R-L+1);
                                      ^
0_0_14218663_29081.cpp: In function 'int main()':
0_0_14218663_29081.cpp:32:9: error: 'ans' was not declared in this scope
         ans=1000000000;
         ^