This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <vector>
using namespace std;
const int N = 7005;
int n, d, a[N], dp[N], ans = 0;
bool f[N][N];
signed main()
{
    cin >> n >> d;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    for (int i = 0; i < n; i++) {
        vector <int> v;
        v.push_back(i);
        for (int j = i - 1; j >= 0; j--) {
            if (v.back() - j > d)
                break;
            if (a[j] < a[i])
                v.push_back(j), f[j][i] = 1;
        }
    }
    dp[n - 1] = 1;
    for (int i = n - 2; i >= 0; i--) {
        dp[i] = 1;
        for (int j = i + 1; j < n; j++)
            if (f[i][j])
                dp[i] = max(dp[i], dp[j] + 1);
        ans = max(ans, dp[i]);
    }
    cout << ans;
    return 0;
}
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