백준 9095번(Java)

import java.io.*;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int T = Integer.parseInt(br.readLine());
		
		for(int i=0; i<T; i++) {
			int n = Integer.parseInt(br.readLine());
			int[] dp = new int[11];
			
			dp[1]=1;
			dp[2]=2;
			dp[3]=4;
			
			for(int j=4; j<=n; j++) {
				dp[j] = dp[j-1]+dp[j-2]+dp[j-3];
			}
			
			System.out.println(dp[n]);
		}
	}
}