algorithmStudy/15988.cpp at master · judy5050/algorithmStudy · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
//
//  15988.cpp
//  algo
//
//  Created by 박효정 on 2021/06/09.
//

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main(){

    cin.tie(0);
    cout.tie(0);
    std::ios::sync_with_stdio(false);
    vector<long long>d(1000001);

    int n;
    cin>>n;

    d[1]=1;
    d[2]=2;
    d[3]=4;
    for(int i=4;i<=1000001;i++){
        d[i]=(d[i-1]+d[i-2]+d[i-3])%1000000009;
    }
    while(n--){
        int a;
        cin>>a;
        cout<<d[a]%1000000009<<"\n";


    }


    return 0;
}