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 == 1) return 1;
        if (number == 2) return 2;
        Queue<Integer> q = new LinkedList<>();
        q.add(2);
        q.add(1);
        for (int i = 3; i <= number; i++) {
            int lastNum = q.poll();
            int llastNum = q.poll();
            int curNum = lastNum + llastNum;
            q.add(curNum);
            q.add(lastNum);
        }
        return q.poll();
    }
}