foo.cc: In function ‘int main()’:
foo.cc:18:15: warning: ‘t2’ may be used uninitialized [-Wmaybe-uninitialized]
   18 |         cout<<t2;
      |               ^~
foo.cc:5:24: note: ‘t2’ was declared here
    5 |         int n,i=1,x,t1,t2;
      |                        ^~