/in/foo.cc: In function 'int main()':
/in/foo.cc:15:18: warning: 'c' may be used uninitialized [-Wmaybe-uninitialized]
   15 |         cout<<a+b+c-1;
      |               ~~~^~
/in/foo.cc:4:19: note: 'c' was declared here
    4 |         int n,a,b,c,i;
      |                   ^