Submission

[P-SSS][SSSSS][SSSSSSSSSS]

Score: 0

User: Nagornz

Problemset: ห้องสมุดเมือง 3M

Language: cpp

Time: 0.002 second

Submitted On: 2025-03-13 20:24:16

#include <bits/stdc++.h>
#define int long long
#define double long double
#define pii pair <int,int>
#define tiii tuple <int, int, int>
#define f first
#define s second
#define all(x) x.begin(), x.end()
#define ub(a, b) upper_bound(a.begin(), a.end(), b) - a.begin();
#define lb(a, b) lower_bound(a.begin(), a.end(), b) - a.begin();
#define ve vector
#define graph(a, n) vector <int> a[n];
#define wgraph(a, n) vector <pii> a[n];
#define emb emplace_back
#define em emplace
#define ins insert
#define er erase
#define iShowSpeed cin.tie(NULL)->sync_with_stdio(false)

using namespace std;

template <typename T>
using greater_priority_queue = priority_queue<T, vector<T>, greater<T>>;

const int mod = 1e9 + 7;
const int inf = 1e18;

int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

int32_t main(){
    iShowSpeed;
    int n; 
    cin >> n;
    int sum = 0;
    int l = 0, r = inf;
    vector <pii> a(n);
    for (auto &[x, y] : a) {
        cin >> x >> y;
        sum += y - x;
    }
    int idx = sum / 2 - 1;
    while (l <= r) {
        int mid = (l + r) / 2;
        int less = 0, same = -1;
        for (auto [x, y] : a) {
            if (mid >= y) {
                less += y - x;
            }
            else if (mid < x) continue;
            else {
                less += mid - x;
                same++;
            }
        }
        if (less + max(same, 0ll) == idx) {
            cout << mid;
            return 0;
        }
        if (less + max(same, 0ll) < idx) l = mid + 1;
        else r = mid - 1;
    }
}