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

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;
}