src/main/java/com/fishercoder/solutions/_252.java

package com.fishercoder.solutions;

import java.util.Arrays;

public class _252 {
    public static class Solution1 {
        public boolean canAttendMeetings(int[][] intervals) {
            if (intervals == null || intervals.length == 0) {
                return true;
            }
            Arrays.sort(intervals, (a, b) -> a[0] - b[0]);
            int end = intervals[0][1];
            for (int i = 1; i < intervals.length; i++) {
                if (intervals[i][0] < end) {
                    return false;
                } else {
                    end = intervals[i][1];
                }
            }
            return true;
        }
    }
}