제출 #1318150

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1318150		kawhiet	Global Warming (CEOI18_glo)	C++20	0 / 100	36 ms	5036 KiB

glo

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

constexpr int inf = 2e9;

vector<int> get(vector<int> a) {
    int n = a.size();
    vector<int> dp(n, inf), r(n);
    for (int i = 0; i < n; i++) {
        int j = ranges::lower_bound(dp, a[i]) - dp.begin();
        dp[j] = a[i];
        r[i] = j + 1;
    }
    return r;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, x;
    cin >> n >> x;
    vector<int> a(n), b(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        b[i] = -(a[i] + x);
    }
    auto l = get(a);
    auto r = get(b);
    int ans = ranges::max(l);
    for (int i = 0; i < n; i++) {
        ans = max(ans, l[i] + r[i] - 1);
    }
    cout << ans << '\n';
    return 0;
}

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