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252. Meeting Rooms 👍

  • Time: $O(\texttt{sort})$
  • Space: $O(\texttt{sort})$
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class Solution {
 public:
  bool canAttendMeetings(vector<vector<int>>& intervals) {
    ranges::sort(intervals);

    for (int i = 1; i < intervals.size(); ++i)
      if (intervals[i - 1][1] > intervals[i][0])
        return false;

    return true;
  }
};

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class Solution {
  public boolean canAttendMeetings(int[][] intervals) {
    Arrays.sort(intervals, (a, b) -> Integer.compare(a[0], b[0]));

    for (int i = 1; i < intervals.length; ++i)
      if (intervals[i - 1][1] > intervals[i][0])
        return false;

    return true;
  }
}

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class Solution:
  def canAttendMeetings(self, intervals: list[list[int]]) -> bool:
    intervals.sort()

    for i in range(1, len(intervals)):
      if intervals[i - 1][1] > intervals[i][0]:
        return False

    return True