Submission #383003

#	Time	Username	Problem	Language	Result	Execution time	Memory
383003		valerikk	Exam (eJOI20_exam)	C++17	65 / 100	383 ms	122988 KiB

exam

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

const int N = 5005;

int a[N], b[N];
bool ok[N][N];
int dp[N][N];

int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif
    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;
}

• Subtask 1: 14 / 14
• Subtask 2: 0 / 12
• Subtask 3: 13 / 13
• Subtask 4: 0 / 23
• Subtask 5: 16 / 16
• Subtask 6: 22 / 22