意思大致是,有个一台阶一步的楼梯,你一次走一或二步,有几种方式可以走到第十个台阶.
1.全走一步的.
2.全走两步的.
3.走两步一步的,然后走4步两步的.
.
只要步子加起来够十步就可以了.
全英文数学题There is a stair of steps.If you can only go up for 1
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