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【LeetCode】Insert Interval
题目
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]
.
先将要插入的间隔段add进原来的,再重新按照间隔段的起点由小到大排序一遍,然后再合并(类似Merge Interval),代码如下:
/** * 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) { if(intervals==null||intervals.size()==0){ intervals.add(newInterval); return intervals; } List<Interval> list=new ArrayList<Interval>(); intervals.add(newInterval); Comparator<Interval> comp=new Comparator<Interval>(){ public int compare(Interval i1,Interval i2){ if(i1.start==i2.start){ return i1.end-i2.end; } return i1.start-i2.start; } }; Collections.sort(intervals,comp); list.add(intervals.get(0)); for(int i=1,len=intervals.size();i<len;i++){ if(list.get(list.size()-1).end<intervals.get(i).start){ list.add(intervals.get(i)); }else{ list.get(list.size()-1).end=Math.max(intervals.get(i).end,list.get(list.size()-1).end); } } return list; } }
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【LeetCode】Insert Interval
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