Starving Priority Queue

If you read problem statement carefully, you probably noticed that:

"Note that on even-numbered seconds monks at first distribute food among the visitors already waiting in the queue and only then receive a newcomer."

So just swap in your program first if statement and block (receiving newcomer) with second if statement + block (food distribution) and you should get right answer.

P. S. Yeah, for example provided in problem statement original program makes right answer, but it is just luck :)...