Submission

Score: 100

User: Jokul

Problemset: จุดตัดบนกราฟ

Language: cpp

Time: 0.025 second

Submitted On: 2026-03-15 10:27:07

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

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

    int N;
    cin >> N;

    vector<long long> P(N);
    for(int i = 0; i < N; i++) cin >> P[i];

    vector<pair<long long,int>> ev;

    for(int i = 0; i < N-1; i++){
        long long l = min(P[i], P[i+1]);
        long long r = max(P[i], P[i+1]);

        ev.push_back({l, 1});
        ev.push_back({r, -1});
    }

    sort(ev.begin(), ev.end(), [](auto &a, auto &b){
        if(a.first == b.first) return a.second < b.second;
        return a.first < b.first;
    });

    int cur = 0, ans = 0;

    for(auto &e : ev){
        cur += e.second;
        ans = max(ans, cur);
    }

    cout << ans;
}