Submission #493209

#	Time	Username	Problem	Language	Result	Execution time	Memory
493209		Rainbowbunny	Global Warming (CEOI18_glo)	C++17	100 / 100	55 ms	4620 KiB

glo

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

const int MAXN = 2e5 + 5;
const int INF = 1e9;

int n, x, sz, ans;
int a[MAXN];
int lds[MAXN], dp[MAXN];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> x;
    for(int i = 1; i <= n; i++)
    {
        cin >> a[i];
        dp[i] = -INF;
    }
    dp[0] = INF;
    for(int i = n; i >= 1; i--)
    {
        int id = lower_bound(dp, dp + sz + 1, a[i], greater <int> ()) - dp;
        lds[i] = id;
        dp[id] = max(dp[id], a[i]);
        sz = max(sz, id);
    }
    ans = sz;
    sz = 0;
    for(int i = 1; i <= n; i++)
    {
        dp[i] = INF;
    }
    dp[0] = -INF;
    for(int i = 1; i <= n; i++)
    {
        int id = lower_bound(dp, dp + sz + 1, a[i]) - dp;
        int zz = upper_bound(dp, dp + sz + 1, a[i] + x - 1) - dp - 1;
        ans = max(ans, zz + lds[i]);
        dp[id] = min(dp[id], a[i]);
        sz = max(sz, id);
    }
    cout << ans << '\n';
}

• 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