/in/foo.cc: In function 'int main()':
/in/foo.cc:19:18: warning: 'c' may be used uninitialized [-Wmaybe-uninitialized]
   19 |         cout<<a+b+c-1;
      |               ~~~^~
/in/foo.cc:5:17: note: 'c' was declared here
    5 |         int a,b,c,n,i;
      |                 ^