Submission

Score: 0

User: Fifaxmb

Problemset: ห้องสมุดเมือง 3M

Language: cpp

Time: 0.002 second

Submitted On: 2026-03-28 12:23:14

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<ll,ll>;
#define Fifa67king ios::sync_with_stdio(0);cin.tie(0);
int main(){
    Fifa67king;
    int n;cin >> n;
    priority_queue<pii, vector<pii>, greater<pii>> pq;
    ll c = 0;
    for(int i = 0; i < n; i++){
        ll a, b; cin >> a >> b;
        pq.push({a,1});pq.push({b,-1});
        c += b-a;
    }
    ll target = c/2, cur = 0, prv = -1;
    while(!pq.empty()){
        auto [pos, d] = pq.top(); pq.pop();
        ll bk = cur*(pos-prv);
        if(prv!=-1 && cur>0 && target<=bk){
            cout << prv+(target-1)/cur;
            return 0;
        }
        if(prv!=-1) target -= bk;
        cur += d; prv = pos;
    }
}