Climbing Stairs 带测试版

public class Solution70 {
public static  int climbStairs(int n) {
int m=0;
if(n<=0) return 0;
if(n==1) return 1;
if(n==2) return 2;
int a=1,b=2,c=0;
for(int i=2;i<n;i++)
{
c=a+b;
a=b;
b=c;
}
return c;
}

public static void main(String[]args)
{
int n=10;
System.out.println(climbStairs(5));
}
}