View Compilation Error

0_0_23769135_30919.cpp: In function 'int main()':
0_0_23769135_30919.cpp:60:17: error: conflicting declaration 'int flag'
   int d=c/gcd,k,flag=0;
                 ^
0_0_23769135_30919.cpp:28:7: note: previous declaration as 'll flag'
    ll flag=1,mark=1;
       ^