HDOJ2070 Fibbonacci Number

Fibbonacci Number

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 26638    Accepted Submission(s): 12205

Problem Description

Your objective for this question is to develop a program which will generate a fibbonacci number. The fibbonacci function is defined as such:

f(0) = 0
f(1) = 1
f(n) = f(n-1) + f(n-2)

Your program should be able to handle values of n in the range 0 to 50.

 

Input

Each test case consists of one integer n in a single line where 0≤n≤50. The input is terminated by -1.

 

Output

Print out the answer in a single line for each test case.

 

Sample Input

3 4 5 -1

 

Sample Output

Hint

Note:

you can use 64bit integer: __int64

 

import java.util.Scanner;

public class Main{
  private static Scanner scanner;
  public static void main(String[] args) {
    scanner = new Scanner(System.in);
    while(scanner.hasNext()){
      int n=  scanner.nextInt();
      if(n == -1){
        break;
      }

      //打表
      long arr[] = new long[51];
      arr[0] = 0;
      arr[1] = 1;
      for (int i = 2; i < arr.length; i++) {
        arr[i] = arr[i-1]+arr[i-2];
      }
      //输出
      System.out.println(arr[n]);
    }
  }
}