LeetCode-670 最大交换

原题连接:[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 题目: 给定一个非负整数,你至多能够交换一次数字
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