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並前往https://leetcode-cn.com/problems/buddy-strings/solution/pythonjavajavascriptgo-yao-yao-xiang-ton-5ylz/

[Python/Java/JavaScript/Go] 要么相同且有重复的字母可以交换

class Solution { public boolean buddyStrings(String s, String goal) ... charAt(i)) if(x == -1) x = i; else if(y == -1) y = i; ...

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