/in/foo.cc: In function 'int main()':
/in/foo.cc:15:11: warning: 'FirstN' may be used uninitialized [-Wmaybe-uninitialized]
   15 |     cout<<FirstN;
      |           ^~~~~~
/in/foo.cc:5:11: note: 'FirstN' was declared here
    5 |     int n,FirstN,temp;
      |           ^~~~~~