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问题：如何检测一个链表是否有环，如果有，那么如何确定环的起点.
Problem D Piotr's Ants Time Limit: 2 seconds "One thing is for certain: there is no stopping them; the ants will soon be here. And I, for one, welcome our new insect overlords."
Programming contests became so popular in the year 2397 that the governor of New Earck -- the largest human-inhabited planet of the galaxy -- opened a special Alley of Contestant Memories (ACM) at the
F. Spreading the Wealth Problem A Communist regime is trying to redistribute wealth in a village. They have have decided to sit everyone around a circular table. First, everyone has converted
G Commando War Input: Standard Input Output: Standard Output “Waiting for orders we held in the wood, word from the front never came By evening the sound of the gunfire was mi
Problem C: The Dragon of Loowater Once upon a time, in the Kingdom of Loowater, a minor nuisance turned into a major problem. The shores of Rellau Creek in central Loowater had always been a prime b
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