Submission #23,309

2026-01-18 20:02:30

cpp17

Accepted 40/40

3ms

1160 KiB

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

const int m=20210108;

int main(){
    int n;cin>>n;
    vector<int> dp(n+1);
    dp[0]=1;
    for(int i=2;i<=n;i++){
        if(i==2)dp[2]=2;
        else dp[i]=1LL*(1LL*dp[i-2]*2%m+1LL*dp[i-3]*2%m)%m;
    }
    cout<<dp[n]<<'\n';
}

	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	324 KiB
		4	Accepted	2/2	1ms	316 KiB
		5	Accepted	3/3	1ms	316 KiB
		6	Accepted	3/3	1ms	316 KiB
		7	Accepted	3/3	3ms	1076 KiB
		8	Accepted	3/3	2ms	820 KiB
		9	Accepted	3/3	1ms	316 KiB
		10	Accepted	3/3	1ms	316 KiB
		11	Accepted	3/3	3ms	1092 KiB
		12	Accepted	3/3	3ms	1160 KiB
		13	Accepted	4/4	3ms	1076 KiB
		14	Accepted	4/4	2ms	820 KiB
		15	Accepted	2/2	1ms	316 KiB
		16	Accepted	2/2	1ms	316 KiB