題目
給出若干閉合區(qū)間，合并所有重疊的部分。
樣例
給出的區(qū)間列表 => 合并后的區(qū)間列表：
merge.PNG
代碼
/**
* Definition of Interval:
* public class Interval {
* int start, end;
* Interval(int start, int end) {
* this.start = start;
* this.end = end;
* }
*/
class Solution {
/**
* @param intervals, a collection of intervals
* @return: A new sorted interval list.
*/
public List<Interval> merge(List<Interval> intervals) {
// write your code here
if (intervals == null || intervals.size() <= 1) {
return intervals;
}
Collections.sort(intervals, new IntervalComparator());
ArrayList<Interval> result = new ArrayList<Interval>();
Interval last = intervals.get(0);
for (int i = 1; i < intervals.size(); i++) {
Interval curt = intervals.get(i);
if (curt.start <= last.end ){
last.end = Math.max(last.end, curt.end);
}else{
result.add(last);
last = curt;
}
}
result.add(last);
return result;
}
private class IntervalComparator implements Comparator<Interval> {
public int compare(Interval a, Interval b) {
return a.start - b.start;
}
}
}
