/**
 * Definition of Interval:
 * public class Interval {
 *     public int start, end;
 *     public Interval(int start, int end) {
 *         this.start = start;
 *         this.end = end;
 *     }
 * }
 */

class Solution {
    public boolean canAttendMeetings(List intervals) {
        Collections.sort(intervals, (a, b) -> Integer.compare(a.start, b.start));
        int n = intervals.size();
        for(int i=1; i