/in/foo.cc: In function 'int main()':
/in/foo.cc:17:10: warning: 'c' may be used uninitialized [-Wmaybe-uninitialized]
   17 | cout<<a+b+c-1;
      |       ~~~^~
/in/foo.cc:5:11: note: 'c' was declared here
    5 | int n,a,b,c,i;
      |           ^