LeetCode-670 最大交換

原題連接：[https://leetcode-cn.com/problems/maximum-swap/](https://leetcode-cn.com/problems/divide-array-in-sets-of-k-consecutive-numbers/solution/java-sorthashmap-by-npe_tle/)java 題目： 給定一個非負整數，你至多能夠交換一次數字

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