题解 | #跳台阶#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param number int整型
     * @return int整型
     */
    public int jumpFloor (int number) {
        // write code here
        if (number == 0) {
            return 0;
        }
        if (number == 1) {
            return 1;
        }
        int lastBefore = 1, last = 1, current = 1;
        // 当前跳台阶怎么跳
        for (int i = 2; i <= number; i++) {
            current  = last + lastBefore;
            lastBefore = last;
            last = current;
        }
        return current;

    }
}