My Calendar I LeetCode solution in C++

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class MyCalendar {
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 public:
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  vector<pair<int, int>> cal;
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  MyCalendar() {}
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  bool book(int start, int end) {
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    for (int i = 0; i < cal.size(); i++) {
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      if (end <= cal[i].first || start >= cal[i].second)
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        continue;
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      else
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        return false;
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    }
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    cal.push_back({start, end});
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    return true;
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  }
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};