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题目啥意思呢？我是不是理解错了？为啥always even? 比如： 3 3 1 2 3 3 2 1 难道答案不是3嘛？ 还有第二组，为啥不是2，我们只用连两个1-1，就不存在a != b的情况，不就可以了吗 Followed by:
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