Find the Kth Largest Integer in the Array LeetCode solution in C++

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class Solution {
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 public:
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  static bool cmp(string &a, string &b) {
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    if (a.size() == b.size()) {
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      return a < b;
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    }
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    return a.size() < b.size();
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  }
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  string kthLargestNumber(vector<string> &nums, int k) {
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    sort(nums.begin(), nums.end(), cmp);
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    int n = nums.size();
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    return nums[n - k];
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  }
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};