Submission

Score: 0

User: tHeNyXs

Problemset: ห้องสมุดเมือง 3M

Language: cpp

Time: 0.003 second

Submitted On: 2026-03-07 06:16:25

#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    int n; cin >> n;
    int mid = 0;
    map<int, int> diff;
    for (int i = 0; i < n; ++i) {
        int x, y; cin >> x >> y;
        diff[x]++;
        diff[y]--;
        mid += y-x;
    }
    mid /= 2;
    int cnt = 0;
    int prev = 0;
    int pfs = 0;

    for (auto i : diff) {
        int now = i.first;
        cnt += (now - prev) * pfs;
        if (cnt >= mid) {
            cnt -= (now - prev) * pfs;
            for (int j = prev; j <= now; ++j) {
                cnt += pfs;
                if (cnt >= mid) {
                    cout << j;
                    return 0;
                }
            }
        }
        prev = now;
        pfs += i.second;
    }

    return 0;
}