Submission

Score: 0

User: Ryuthin94

Problemset: ห้องสมุดเมือง 3M

Language: cpp

Time: 0.002 second

Submitted On: 2026-03-05 23:50:39

#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, s = 0;
    if (!(cin >> n))
    {
        return 0;
    }

    vector<pair<int, int>> lib(n);
    for (int i = 0; i < n; i++)
    {
        cin >> lib[i].first >> lib[i].second;
    }
    sort(lib.begin(), lib.end());

    for (int i = 0; i < n; i++)
    {
        s = s + (lib[i].second - lib[i].first);
    }

    int t = s / 2;
    int cum = 0;
    for (int i = 0; i < n; i++)
    {
        int count = lib[i].second - lib[i].first;
        if (cum + count >= t)
        {
            int offset = t - cum;
            cout << lib[i].first + offset - 1;
            return 0;
        }
        cum += count;
    }
    return 0;
}