제출 #895824

#제출 시각아이디문제언어결과실행 시간메모리
895824tvladm2009Exam (eJOI20_exam)C++17
65 / 100
78 ms123172 KiB
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int N = 5e3 + 7;
int a[N], b[N];
bool ok[N][N];
int dp[N][N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) cin >> b[i];
    for (int i = 0; i < n; i++) {
        ok[i][i] = true;
        for (int j = i - 1; j >= 0; j--) {
            if (a[j] > a[i]) break;
            ok[j][i] = true;
        }
        for (int j = i + 1; j < n; j++) {
            if (a[j] > a[i]) break;
            ok[j][i] = true;
        }
    }
    for (int i = 0; i < n; i++) {
        if (ok[0][i] && b[0] == a[i]) {
            dp[0][i] = 1;
        }
    }
    for (int i = 1; i < n; i++) {
        int mx = 0;
        for (int j = 0; j < n; j++) {
            mx = max(mx, dp[i - 1][j]);
            if (ok[i][j]) {
                dp[i][j] = mx;
                if (b[i] == a[j]) ++dp[i][j];
            }
        }
    }
    int ans = 0;
    for (int i = 0; i < n; i++) ans = max(ans, dp[n - 1][i]);
    cout << ans << endl;
    return 0;
}
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