Submission #1243734

#	Time	Username	Problem	Language	Result	Execution time	Memory
1243734		wedonttalkanymore	Global Warming (CEOI18_glo)	C++20	28 / 100	2095 ms	2872 KiB

glo

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

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320;

int dp[N][2];
int n, x;
int a[N];

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> x;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= n; i++) {
        dp[i][0] = 1;
        for (int j = 1; j < i; j++) {
            if (a[j] < a[i]) {
                dp[i][0] = max(dp[i][0], dp[j][0] + 1);
                dp[i][1] = max(dp[i][1], dp[j][1] + 1);
            }
        }
        int Left = max(0LL, a[i] - x - 1);
        int Right = a[i] + x - 1;
        for (int j = 1; j < i; j++) {
            if (Left <= a[j] && a[j] <= Right) {
                dp[i][1] = max(dp[i][1], dp[j][0] + 1);
            }
        }
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j <= 1; j++) ans = max(ans, dp[i][j]);
    }
    cout << ans;
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25