/in/foo.cc: In function 'int main()':
/in/foo.cc:16:21: warning: 'c' may be used uninitialized [-Wmaybe-uninitialized]
   16 |         cout<<a+b+c-1;
      |                     ^
/in/foo.cc:5:17: note: 'c' was declared here
    5 |         int a,b,c,i,n;
      |                 ^