评测记录

CODE

#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 5;
int a[MAXN],b1[MAXN],b2[MAXN],n,sum;

int main(){
	cin>>n;
	for(int i = 1;i <= n;i++){
		cin>>a[i]>>b1[i];
		b2[i] = a[i] - b1[i];
	}
	sort(b1+1,b1+n+1);
	sort(b2+1,b2+n+1);
	sum = b1[n] + b2[n];
	cout<<sum;
	return 0;
}