Problem:
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Fibonacci Number

Write a program which prints $n$-th fibonacci number for a given integer $n$. The $n$-th fibonacci number is defined by the following recursive formula:

\begin{equation*}
fib(n)= \left \{
\begin{array}{ll}
1　 & (n = 0) \\
1　 & (n = 1) \\
fib(n - 1) + fib(n - 2) & \\
\end{array}
\right.
\end{equation*}

Input

An integer $n$ is given.

output

Print the $n$-th fibonacci number in a line.

Constraints

$0 \leq n \leq 44$

Sample Input 1

3

Sample Output 1

3

Solution in JAVA (judge verdict: Accepted)

import java.util.*;
import java.io.*;

public class Main {
	public static void main(String[]  args) {
		Scanner scanner = new Scanner(System.in);
		
		int n = scanner.nextInt();
		scanner.close();
		
		int[] fib = new int[n + 1];
		for (int i = 0; i <= n; i ++) {
			fib[i] = (i < 2) ? 1: fib[i - 1] + fib[i - 2];
		}
		
		System.out.println(fib[n]);
	}
}