foo.cc: In function ‘int main()’:
foo.cc:23:7: warning: ‘j’ may be used uninitialized [-Wmaybe-uninitialized]
   23 |       if(j==d-1)
      |       ^~
foo.cc:10:12: note: ‘j’ was declared here
   10 |    int c,d,j;
      |            ^