foo.cc: In function 'int main()':
foo.cc:19:18: warning: 'j' may be used uninitialized [-Wmaybe-uninitialized]
   19 |         cout<<j<<" "<<maxn<<endl<<k<<" "<<minn;
      |                  ^~~
foo.cc:6:13: note: 'j' was declared here
    6 |         int j,k;
      |             ^
foo.cc:19:38: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized]
   19 |         cout<<j<<" "<<maxn<<endl<<k<<" "<<minn;
      |                                      ^~~
foo.cc:6:15: note: 'k' was declared here
    6 |         int j,k;
      |               ^