Number of Recent Calls LeetCode solution in C++

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class RecentCounter {
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 public:
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  queue<int> q;
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  RecentCounter() {}
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  int ping(int t) {
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    q.push(t);
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    int x = q.front();
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    while (x < t - 3000) {
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      q.pop();
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      x = q.front();
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    }
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    return q.size();
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  }
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};