/in/foo.cc: In function 'void djskl1()':
/in/foo.cc:36:9: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   vis[k]=true;
   ~~~~~~^~~~~
/in/foo.cc: In function 'void djskl2()':
/in/foo.cc:79:9: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   vis[k]=true;
   ~~~~~~^~~~~