/in/foo.cc: In function 'int main()':
/in/foo.cc:6:14: error: 'n' was not declared in this scope
    6 |         cin>>n;
      |              ^
/in/foo.cc:10:21: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   10 |                 if(N=0)
      |                    ~^~