There are n walruses standing in a queue in an airport. They are numbered starting from the queue’s tail: the 1-st walrus stands at the end of the queue and the n-th walrus stands at the beginning of the queue. The i-th walrus has the age equal to ai.There are n walruses standing in a queue in
阅读背景：
Codeforces Beta Round #75 (Div. 1 Only)---B.Queue
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