[LC] 252. Meeting Rooms

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings.

Example 1:

Input: [[0,30],[5,10],[15,20]]
Output: false

Example 2:

Input: [[7,10],[2,4]]
Output: true

NOTE: input types have been changed on April 15, 2019. Please reset to default code definition to get new method signature.

class Solution {
    public boolean canAttendMeetings(int[][] intervals) {
        if (intervals == null || intervals.length == 0) {
            return true;
        }
        Arrays.sort(intervals, (a, b) -> a[0] - b[0]);
        for (int i = 1; i < intervals.length; i++) {
            if (intervals[i - 1][1] > intervals[i][0]) {
                return false;
            }
        }
        return true;
    }
}