Submission #21,331

2026-01-12 18:32:47

cpp17

Accepted 40/40

1ms

564 KiB

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

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<long long> f(n + 1), g(n + 1);
    f[0] = 1;
    if (n >= 1) f[1] = 1;

    for (int i=2; i <= n; i++) {
        f[i] = f[i - 1] + f[i - 2] + 2 * g[i - 1];
        g[i] = g[i - 1] + f[i - 2];
    }

    cout << f[n] << '\n';

    return 0;
}

	Sum	Test	Verdict		Time	Memory
base	40/40
		1	Accepted	0/0	1ms	316 KiB
		2	Accepted	0/0	1ms	316 KiB
		3	Accepted	2/2	1ms	500 KiB
		4	Accepted	2/2	1ms	564 KiB
		5	Accepted	2/2	1ms	316 KiB
		6	Accepted	2/2	1ms	316 KiB
		7	Accepted	2/2	1ms	316 KiB
		8	Accepted	3/3	1ms	316 KiB
		9	Accepted	3/3	1ms	316 KiB
		10	Accepted	3/3	1ms	316 KiB
		11	Accepted	3/3	1ms	508 KiB
		12	Accepted	3/3	1ms	508 KiB
		13	Accepted	3/3	1ms	316 KiB
		14	Accepted	3/3	1ms	316 KiB
		15	Accepted	3/3	1ms	316 KiB
		16	Accepted	3/3	1ms	316 KiB
		17	Accepted	3/3	1ms	316 KiB