题解 | 小乐乐走台阶

#include <stdio.h>
int StepFun1(int n)
{
	if (n == 1)
	{
		return 1;
	}
	else if (n == 2)
	{
		return 2;
	}
	return StepFun1(n - 1) + StepFun1(n - 2);
}

int main()
{
	int n = 0; 
	int ret = 0;
	scanf("%d", &n); 
	if (n >= 1 && n <= 30)
	{
		ret = StepFun1(n); 
	}
	printf("%d\n", ret);  
	return 0; 
}