My Calendar II LeetCode solution in C++

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class MyCalendarTwo {
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 public:
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  map<int, int> mpp;
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  MyCalendarTwo() {}
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  bool book(int start, int end) {
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    mpp[start]++;
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    mpp[end]--;
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    int sum = 0;
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    for (auto it : mpp) {
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      sum += it.second;
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      if (sum > 2) {
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        mpp[start]--;
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        mpp[end]++;
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        return false;
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      }
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    }
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    return true;
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  }
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};