/in/foo.cc: In function 'int main()':
/in/foo.cc:39:38: warning: 'start' may be used uninitialized [-Wmaybe-uninitialized]
   39 |                         if(!dis[tmp] && tmp!=start){
      |                            ~~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:18:9: note: 'start' was declared here
   18 |     int start;
      |         ^~~~~