买菜201809-2

Posted 2022-05-23 wudie

#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main()

	vector <int> a,b;
	int sum=0;
	int n;
	cin>>n;
	for(int i=0;i<n;i++)
	
		int x;
		int y;
		cin>>x>>y;
		a.push_back(x);
		b.push_back(y);
		
	
	for(int i=0;i<n;i++)
	
		int x;
		int y;
		cin>>x>>y;
		for(int j=0;j<n;j++)
		
			if(y<=a[j])
			break;
			if(x>=b[j])
			continue;
			sum+=((b[j]-a[j])+(y-x)-((x>=a[j]?(x-a[j]):(a[j]-x)))-((y>=b[j]?(y-b[j]):(b[j]-y))))/2;
		
	
	cout<<sum<<endl;
	return 0;