Submission #895818

#	Time	Username	Problem	Language	Result	Execution time	Memory
895818		tvladm2009	Exam (eJOI20_exam)	C++17	0 / 100	5 ms	600 KiB

exam

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    vector<int> a(n + 1), b(n + 1), r(n + 1);
    map<int, int> pos;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
        pos[a[i]] = i;
    }
    for (int i = 1; i <= n; ++i) {
        cin >> b[i];
    }
    for (int i = n; i >= 1; --i) {
        r[i] = pos[b[i]];
    }
    vector<int> dp(n + 1, 0);
    for (int i = n; i >= 1; --i) {
        if (r[i] == 0) {
            dp[i] = dp[i + 1];
            continue;
        }
        int ans = 0;
        for (int j = i; j <= r[i]; ++j) ans += b[j] == b[i];
        dp[i] = max(dp[i + 1], dp[r[i] + 1] + ans);
    }
    cout << dp[1] << endl;
    return 0;
}

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