Submission

Score: 100

User: kenmuay

Problemset: จุดตัดบนกราฟ

Language: cpp

Time: 0.022 second

Submitted On: 2026-02-28 22:37:17

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

const int maxn = 1e5+10;
int a[maxn];
struct GRAPH {
    int u,w;
    bool operator < (const GRAPH &o) const{
        if(u != o.u) return u<o.u;
        return w<o.w;
    }
};
vector<GRAPH> v;
int main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    int n;
    cin >> n;

    for(int i=0; i<n; i++){
        cin >> a[i];
    }
    for(int i=1; i<n; i++){
        if(a[i] > a[i-1]){
            v.push_back({a[i-1], 1});
            v.push_back({a[i], -1});
        }
        if(a[i] <= a[i-1]){
            v.push_back({a[i-1], -1});
            v.push_back({a[i], 1});
        }
    }
    sort(v.begin(), v.end());
    long long sums = 0;
    long long mx=0;
    for(int i=0; i<2*n; i++){
        int w = v[i].w;
        sums+=w;
        mx = max(sums,mx);
    }
    cout << mx;
}

/*
7
1 2 1 2 1 3 2
*/