AC * 30 , WA * 1 ,WA on 02_random2_17.txt

record

code:

#include<bits/stdc++.h>
typedef long long int ll;
using namespace std;
const int maxn=2e5+10;
int n,a,b;
pair<int,int>p[maxn];
int main(){
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a>>b;
		if(a>b)swap(a,b);
		p[i].first=a,p[i].second=b;
	}
	sort(p,p+n);
	for(int i=0;i<n-1;i++){
		int j=i;
		while(p[i].first==p[j].first)j++;
		if(p[i].second>p[j].first&&p[i].second<p[j].second){
			cout<<"Yes";
			return 0;
		}
	}
	cout<<"No";
	return 0;
}