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BOJ_10844.java

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package charlesuu;

import java.util.Scanner;

public class BOJ_10844 {

public static long mod = 1000000000L;

public static void main(String args[]) {

Scanner sc = new Scanner(System.in);

int n = sc.nextInt();

long[][] d = new long[n + 1][10];

for (int i = 1; i <= 9; i++) {

d[1][i] = 1;

}

for (int i = 2; i <= n; i++) {

for (int j = 0; j <= 9; j++) {

d[i][j] = 0;

if (j - 1 >= 0) {

d[i][j] += d[i - 1][j - 1];

}

if (j + 1 <= 9) {

d[i][j] += d[i - 1][j + 1];

}

d[i][j] %= mod;

}

}

long ans = 0;

for (int i = 0; i <= 9; i++) {

ans += d[n][i];

}

ans %= mod;

System.out.println(ans);

}

}