foo.cc: In function 'int main()':
foo.cc:5:18: warning: unused variable 'it' [-Wunused-variable]
    5 |         int n,nt,it;cin>>n;
      |                  ^~
foo.cc:15:15: warning: 'nt' may be used uninitialized [-Wmaybe-uninitialized]
   15 |         cout<<nt;
      |               ^~
foo.cc:5:15: note: 'nt' was declared here
    5 |         int n,nt,it;cin>>n;
      |               ^~

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