View Compilation Error

0_0_35960174_5990.cpp: In function 'int main()':
0_0_35960174_5990.cpp:85:13: error: 'f1' was not declared in this scope
         if(!f1)
             ^
0_0_35960174_5990.cpp:95:34: error: 'maxn' was not declared in this scope
             if(f[i]>=minn&&f[i]<=maxn)
                                  ^