leetCode 57.Insert Interval (插入区间) 解题思路和方法
2024-08-28 03:01:13
Insert Interval
Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).
You may assume that the intervals were initially sorted according to their start times.
Example 1:
Given intervals [1,3],[6,9], insert and merge [2,5] in as [1,5],[6,9].
Example 2:
Given [1,2],[3,5],[6,7],[8,10],[12,16], insert and merge [4,9] in as [1,2],[3,10],[12,16].
This is because the new interval [4,9] overlaps with [3,5],[6,7],[8,10].
思路:插入合并就可以,相比于上一题。这题还要简单一些。
详细代码例如以下:
/**
* 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 List<Interval> insert(List<Interval> intervals, Interval newInterval) {
List<Interval> list = new ArrayList<Interval>();
//边界情况
if(intervals.size() == 0){
list.add(newInterval);
return list;
}
//循环推断
for(int i = 0; i < intervals.size();i++){
//假设新的区间结束值小于開始值。则直接插入前面。后面依次插入就可以
if(newInterval.end < intervals.get(i).start){
list.add(newInterval);
for(int j = i; j < intervals.size(); j++){
list.add(intervals.get(j));
}
break;
}
//新的区间開始点大于结束点。则当前点直接加入结果集
else if(newInterval.start > intervals.get(i).end){
list.add(intervals.get(i));
}
//须要合并的情况
else{
//合并区间
newInterval.start = Math.min(newInterval.start,intervals.get(i).start);
newInterval.end = Math.max(newInterval.end,intervals.get(i).end);
}
if(i == intervals.size() - 1){//假设是最后一个数据。也加入结果集中
list.add(newInterval);
}
}
return list;
}
}
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