/in/foo.cc: In function 'int main()':
/in/foo.cc:13:15: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized]
   13 |         cout<<x;
      |               ^
/in/foo.cc:5:15: note: 'x' was declared here
    5 |         int n,x,s=0;
      |               ^