Confronto de Horários

#include "bits/stdc++.h"

using namespace std;

bool tem_sobreposicao(pair<int, int> a, pair<int, int> b) {
    return a.first >= b.first && a.first < b.second ||
            b.first >= a.first && b.first < a.second;
}

int main() {
    int n;
    vector<pair<int, int>> v;

    cin >> n;
    for(int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;
        v.push_back(make_pair(x, y));
    }

    for(int i = 0; i < n; ++i)
        for(int j = 0; j < n; ++j)
            if(i != j && tem_sobreposicao(v[i], v[j])) {
                cout << "YES\n";
                return 0;
            }

    cout << "NO\n";

    return 0;
}