/in/foo.cc:3:9: error: expected unqualified-id before 'int'
 int n,k,int cnt=0;
         ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:12:4: error: 'cnt' was not declared in this scope
    cnt++;
    ^~~
/in/foo.cc:18:17: error: 'cnt' was not declared in this scope
    cout<<"OK "<<cnt;
                 ^~~