Submission

Score: 100

User: vachirasawin

Problemset: จุดตัดบนกราฟ

Language: cpp

Time: 0.048 second

Submitted On: 2026-03-13 17:51:47

// grader-chan
// c2_st66_intersection.cpp | c2_st66_intersection

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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int N;
    cin >> N;

    map<int, int> mp;
    int prev;
    cin >> prev;
    for (int i = 1; i < N; i++) {
        int y;
        cin >> y;

        int mn = min(y, prev); // Find Start
        int mx = max(prev, y); // Find End

        prev = y;

        mp[mn]++; // Start +1
        mp[mx]--; // End - 1
    }

    int ans = 0;
    int sum = 0;
    for (auto [idx, cnt] : mp) {
        sum += cnt;
        ans = max(ans, sum);
    }

    cout << ans;

    return 0;
}