Longest Uncommon Subsequence I LeetCode solution in C++

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class Solution {
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 public:
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  int findLUSlength(string a, string b) {
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    if (a == b) {
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      return -1;
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    }
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    if (a.size() >= b.size()) {
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      return a.size();
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    }
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    return b.size();
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  }
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};