480A - Exams - CodeForces Solution

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<vector>
#include<algorithm>

#define ll long long 
#define ii int

#define vll vector<ll>
#define vint vector<int>
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()

#define fr1(i, s, n, e) for(ll i=s;i>=n;i-=e)
#define fr3(i, s, n, e) for(ll i=s;i<n;i+=e)
#define fore(i, l, r) for(ii i = ii(l); i < ii(r); i++)

#define fi(vector) for(auto &i : vector)
#define fo(vector) for(auto d : vector)

#define FIO ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);

using namespace std;

void FAISAL()
{
    ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
}

int main()
{
    FAISAL();
    ll n, best = 0; cin >> n;
    vector < pair < ll, ll >>v(n);
    for (auto& [a, b] : v)
        cin >> a >> b;

    sort(all(v));
    fore(i, 0, n)
    {
        if (best <= v[i].second)
            best = v[i].second;
        else
            best = v[i].first;
    }
    cout << best;
}