杭电（hdu）2070 Fibbonacci Number 水题

Fibbonacci Number

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 17675    Accepted Submission(s): 8422

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

这是一道编程最基础最基础入门的题目了，在ACM上面的话讲就是水题，我们采用外围打表法，可以降低时间复杂度。

代码如下：

#include 
#include 
using namespace std;

long long a[51];
void initial()
{
	a[0]=0;
	a[1]=1;
	for(int i=2;i<=50;i++)
	{
		a[i]=a[i-1]+a[i-2];
	}
}

int main()
{
	int n;
	initial();
	while(cin>>n&&n!=-1)
	{
		cout<