Submission #21,631

2026-01-13 17:30:39

cpp17

Accepted 40/40

1ms

508 KiB

// UUID: f486fe4a-0d74-4a5e-8187-25b54f12ae46
#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin>>n;
	long long dp[29]={0};
	dp[0]=1;
	dp[1]=1;
	dp[2]=2;
	for (int i=3;i<=n;i++){
		dp[i]=2* dp[i-1] + dp[i-3];
	}
	cout<<dp[n]<<endl;
	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	316 KiB
		4	Accepted	2/2	1ms	316 KiB
		5	Accepted	2/2	1ms	508 KiB
		6	Accepted	2/2	1ms	316 KiB
		7	Accepted	2/2	1ms	508 KiB
		8	Accepted	3/3	1ms	316 KiB
		9	Accepted	3/3	1ms	508 KiB
		10	Accepted	3/3	1ms	492 KiB
		11	Accepted	3/3	1ms	316 KiB
		12	Accepted	3/3	1ms	508 KiB
		13	Accepted	3/3	1ms	508 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