Leetcode: 70. Climbing Stairs(Week1, Easy)

注: 本文使用三种方法实现Fibonacci Sequence:递归法、非递归法、矩阵快速幂法ios Leetcode 70 You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct wa
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