HDU 2070 Fibbonacci Number

Fibbonacci Number

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 13400    Accepted Submission(s): 6677

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

 

#include<stdio.h>
__int64 a[55]={0,1};
int main()
{
	int i;
	int m;
	for(i=2;i<51;i++)
	a[i]=a[i-1]+a[i-2];
	while(scanf("%d",&m)&&(m!=-1))
	{
		printf("%I64d\n",a[m]);
	}
	return 0;
}

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