70. Climbing Stairs
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 ways can you climb to the top?
Note: Given n will be a positive integer.
思路:到第n个台阶的迈法种数=到第n-1个台阶的迈法种数(再往上迈一步)+到第n-2个台阶的迈法种数(再往上迈两步)。斐波那契数列的问题。