/in/foo.cc: In function 'int main()':
/in/foo.cc:11:33: warning: iteration 99u invokes undefined behavior [-Waggressive-loop-optimizations]
  for(int i=1;i<=100;i++)if(ans[i]>ans[k])k=i;
                                 ^
/in/foo.cc:11:15: note: containing loop
  for(int i=1;i<=100;i++)if(ans[i]>ans[k])k=i;
               ^