leetcode-22-string

 521. Longest Uncommon Subsequence I find the longest uncommon subsequence of this group of two strings 解題思路： 因爲求的是最長uncommon subsequence的長度，所以，如果ab長度不等，應返回長度較大值；ab相同，則返回-1；否則返回長度即可。 int findLUSlength

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