/in/foo.cc: In function 'int main()':
/in/foo.cc:14:7: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations]
   t[i]=1;
   ~~~~^~
/in/foo.cc:12:15: note: within this loop
  for(int i=1;i<=100000;i++)
              ~^~~~~~~~
/in/foo.cc:40:10: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cost[k]=0;
   ~~~~~~~^~