Sort a linked list in O time using constant space complexity.思路类似快排的思路，进行递归partition。主要是注意处理一些边界条件。每次对一个子段进行sort了之后，要处理好其和原先整链的首
Given an array of scores that are non-negative integers. Player 1 picks one of the numbers from either end of the array followed
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