Codeforces Round #497 (Div. 2) B.Turn the Rectangles(水题)

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;

int main()
{
  int n,a,b;
  int Max = 1e9 + 10;
  cin>>n;
  int flag = 0;
  while(n--){
    cin>>a>>b;
    if(a > Max && b > Max){
      flag = 1;
    }
    if(a < b)swap(a,b);
    if(a > Max)Max = b;
    else Max = a;
  }
  if(!flag)
  cout<<"YES"<<endl;
  else cout<<"NO"<<endl;
  return 0;
}