华为OJ题目，带答案。今年的题目是上楼梯问题-Huawei OJ questions with answers

codeforces 472B 关于上楼梯问题，给定一定的规则，求把所有人都送达目的地所需的最短时间-codeforces 472B On the stairs on the issue, given certain rules, seeking to reach all destinations shortest time needed

从1楼到2楼有h级台阶，某同学上楼的习惯是一次上1级或2级，写一算法输出该同学上这h级台阶时的所有不同的上法，用回溯法实现，开辟堆栈保存上楼方法(From the 1 floor to the 2 floor H steps, a classmate upstairs is a habit of 1 or 2, write an algorithm to the output of the students on the H level