Submission #24,586

2026-02-12 21:07:00

cpp17

Accepted 50/50

13ms

8144 KiB

// Source: https://usaco.guide/general/io

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

const int MOD=20210108;

signed main() {
    int n;cin>>n;
    vector<int> dp(n+1);
    dp[0]=1;
    dp[1]=2;
    dp[2]=4;
    for(int i = 3;i<=n;i++){
        dp[i]=dp[i-1]*2+dp[i-3]*2;
        dp[i]%=MOD;
    }
    cout<<dp[n];
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	1ms	508 KiB
		2	Accepted	0/0	2ms	316 KiB
		3	Accepted	3/3	1ms	316 KiB
		4	Accepted	3/3	1ms	316 KiB
		5	Accepted	4/4	1ms	316 KiB
		6	Accepted	4/4	1ms	508 KiB
		7	Accepted	4/4	13ms	8016 KiB
		8	Accepted	4/4	2ms	1332 KiB
		9	Accepted	4/4	1ms	316 KiB
		10	Accepted	4/4	1ms	388 KiB
		11	Accepted	4/4	3ms	1936 KiB
		12	Accepted	4/4	13ms	8144 KiB
		13	Accepted	4/4	13ms	7136 KiB
		14	Accepted	4/4	4ms	3012 KiB
		15	Accepted	2/2	1ms	316 KiB
		16	Accepted	2/2	1ms	316 KiB