/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: warning: 'N' is used uninitialized [-Wuninitialized]
    8 |         while(N--){
      |               ~^~
/in/foo.cc:6:13: note: 'N' was declared here
    6 |         int N,maxx=-1;
      |             ^