题解 | #合并区间#

import java.util.*;
/**
 * 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 ArrayList<Interval> merge(ArrayList<Interval> intervals) {
        if (intervals == null) {
            return new ArrayList<>();
        }
        intervals.sort((o1, o2) -> o1.start - o2.start);
        ArrayList<Interval> result = new ArrayList<>();
        for (Interval interval : intervals) {
            int resSize = result.size();
            if (resSize > 0) {
                Interval res = result.get(resSize - 1);
                if (res.end >= interval.start) {
                    res.end = Math.max(interval.end, res.end);
                    continue;
                }
            }
            result.add(interval);
        }
        return result;
    }
}