Submission #17,530

2025-07-18 11:04:04

cpp17

Accepted 50/50

46ms

8116 KiB

#include <iostream>
#include <vector>

using namespace std;

int MOD=20210108;

int main()
{
    int n;
    cin>>n;
    vector<long long> dp (n+1,0);
    dp[0]=1;
    dp[1]=2;
    dp[2]=4;

    for(int i=3;i<=n;i++)
        {
        dp[i]=(dp[i]+dp[i-1]*2)%MOD;
        if(i>=3)
            {
            dp[i]=(dp[i]+dp[i-3]*2)%MOD;
            }
        }
    cout<<dp[n];
    return 0;
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	1ms	316 KiB
		2	Accepted	0/0	1ms	508 KiB
		3	Accepted	3/3	1ms	316 KiB
		4	Accepted	3/3	1ms	500 KiB
		5	Accepted	4/4	1ms	316 KiB
		6	Accepted	4/4	1ms	316 KiB
		7	Accepted	4/4	46ms	8116 KiB
		8	Accepted	4/4	7ms	1332 KiB
		9	Accepted	4/4	1ms	316 KiB
		10	Accepted	4/4	1ms	316 KiB
		11	Accepted	4/4	10ms	1996 KiB
		12	Accepted	4/4	46ms	7992 KiB
		13	Accepted	4/4	43ms	7220 KiB
		14	Accepted	4/4	17ms	2868 KiB
		15	Accepted	2/2	1ms	316 KiB
		16	Accepted	2/2	1ms	316 KiB