Fibbonacci Number

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 44158    Accepted Submission(s): 19610

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

2
3
5

Hint
Note:
 
you can use 64bit integer: __int64

代码：

#include<stdio.h>
int main()
{
	long long a[55];
	int i,n;
	a[0] = 0;
	a[1] = 1;
	for(i=2;i<=50;i++)
		a[i] = a[i-1]+a[i-2];
	while(scanf("%d",&n)!=EOF)
	{
		if(n==-1)
			break;
		printf("%lld\n",a[n]);
	}
	return 0;
}