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.

For example,

Given [[0, 30],[5, 10],[15, 20]],

return false.

/**
 * Definition for an interval.
 * public class Interval {
 *     int start;
 *     int end;
 *     Interval() { start = 0; end = 0; }
 *     Interval(int s, int e) { start = s; end = e; }
 * }
 */
public class Solution {
    public boolean canAttendMeetings(Interval[] intervals) {
        if(intervals == null || intervals.length <= 1) return true;

        Comparator<Interval> comp = new Comparator<Interval>(){
            @Override
            public int compare(Interval a , Interval b){
                if(a.start == b.start){
                    return a.end - b.end;
                }else{
                    return a.start - b.start;
                }

            }
        };
        Arrays.sort(intervals, comp);
        for(int i=1; i< intervals.length; i++){
            Interval cur = intervals[i];
            Interval prev = intervals[i-1];

            if(cur.start < prev.end) return false;
        }

        return true;
    }
}