Submission #1195385

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195385		marcus06	Global Warming (CEOI18_glo)	C++20	100 / 100	38 ms	2776 KiB

glo

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

#ifdef LOCAL
#include </home/marcus06/mycp/Library/debug.h>
#else
#define debug(...) 
#endif

void solve() {
    int n, x;
    cin >> n >> x;

    vector <int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }

    vector <int> lis;
    vector <int> pre(n);
    for (int i = 0; i < n; ++i) {
        int p = lower_bound(lis.begin(), lis.end(), a[i] - x) - lis.begin();
        if (p == (int) lis.size()) {
            lis.push_back(a[i] - x);
        } else {
            lis[p] = a[i] - x;
        }
        pre[i] = p + 1;
    }

    lis.clear();
    int ans = 1;
    for (int i = n - 1; i >= 0; --i) {
        int p = lower_bound(lis.begin(), lis.end(), a[i], greater <int>()) - lis.begin();
        int p2 = lower_bound(lis.begin(), lis.end(), a[i] - x, greater <int>()) - lis.begin();
        if (p == (int) lis.size()) {
            lis.push_back(a[i]);
        } else {
            lis[p] = a[i];
        }
        ans = max(ans, pre[i] + p2);
    }
    cout << ans << '\n';
}

int main() {
    std::cin.tie(0)->sync_with_stdio(0);
#ifdef LOCAL
    auto begin = std::chrono::high_resolution_clock::now();
#endif

    int tt = 1;
    while (tt--) {
        solve();
    }

#ifdef LOCAL
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    std::cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
#endif
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25