#include <bits/stdc++.h> using namespace std; bool cmp(pair<int, int> a, pair<int, int> b) { return a.first == b.first ? a.second < b.second : a.first < b.first; } int main() { int n; pair<int, int> p[200005]; cin >> n; for (int i = 0; i < n; i++) { cin >> p[i].first >> p[i].second; } sort(p, p + n, cmp); int tv1 = -1, tv2 = -1; for (int i = 0; i < n; i++) { if (p[i].first > tv1) { tv1 = p[i].second; } else { if (p[i].first > tv2) { tv2 = p[i].second; } else { cout << "NO" << endl; return 0; } } } cout << "YES" << endl; return 0; }