Meeting Rooms

给一个数组, 里面是intervals, 问是不是有重叠的. 直接sort下就好.

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