Insert Interval

标签：

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].

醉了，代码写的太乱，不过还是ac了

#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
using namespace std;

struct Interval {
	int start;
	int end;
	Interval() : start(0), end(0) {}
	Interval(int s, int e) : start(s), end(e) {}
};

struct overlap: public binary_function<Interval,Interval,bool>
{
	bool operator()(const Interval &x, const Interval &y)const{
		if (y.start > x.end || y.end < x.start)
			return false;
		else
			return true;
	}
};
struct myless : public binary_function<Interval, Interval, bool>
{
	bool operator()(const Interval &x, const Interval &y)const{
		if (y.start > x.start)
			return false;
		else
			return true;
	}
};
vector<Interval> insert(vector<Interval> &intervals, Interval newInterval) {
	vector<Interval> Result;
	if (intervals.empty()){
		Result.push_back(newInterval);
		return Result;
	}
	//寻找不重合的第一个区间.
	vector<Interval>::iterator iter_begin = find_if(intervals.begin(), intervals.end(), bind2nd(overlap(), newInterval));
	Result.assign(intervals.begin(), iter_begin);
	if (iter_begin==intervals.end())
	{
		auto it = find_if(Result.begin(),Result.end(), bind2nd(myless(), newInterval));
		Result.insert(it, newInterval);
		return Result;
	}
	//确定重合区间的头尾
	Interval *merge = new Interval();
	if (newInterval.start < (*iter_begin).start)
		merge->start = newInterval.start;
	else
		merge->start = (*iter_begin).start;
	int end_tmp = 0;
	vector<Interval>::iterator iter = iter_begin;
	for (;iter != intervals.end(); ++iter){
		if (iter->start>newInterval.end){
			merge->end = end_tmp;
			break;
		}	
		else
			end_tmp = max(newInterval.end, iter->end);
	}
	if (iter == intervals.end())
		merge->end = end_tmp;
	Result.push_back(*merge);
	//插入余下的区间
	Result.insert(Result.end(), iter, intervals.end());
	return Result;		
}

Insert Interval

标签：

原文地址：http://blog.csdn.net/li_chihang/article/details/44180849