Submission #520945

#	Time	Username	Problem	Language	Result	Execution time	Memory
520945		four_specks	Global Warming (CEOI18_glo)	C++17	100 / 100	50 ms	6852 KiB

glo

#include <bits/stdc++.h>

using namespace std;

inline namespace
{
} // namespace

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

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

    vector<long> lis, lds;

    vector<int> dp(n, 0);
    for (int i = n - 1; i >= 0; i--)
    {
        auto it = lower_bound(lds.begin(), lds.end(), -t[i]);
        dp[i] = (int)(it - lds.begin()) + 1;
        if (it == lds.end())
            lds.push_back(-t[i]);
        else
            *it = -t[i];
    }

    int len = 0;
    for (int i = 0; i < n; i++)
    {
        len = max(len, dp[i] + (int)(lower_bound(lis.begin(), lis.end(), t[i] + x) - lis.begin()));

        auto it = lower_bound(lis.begin(), lis.end(), t[i]);
        if (it == lis.end())
            lis.push_back(t[i]);
        else
            *it = t[i];
    }

    cout << len << '\n';
}

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

    solve();

    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