19 Dec 70. Climbing Stairs
You are climbing a staircase. It takes n steps to reach the top.
Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
Example 1:
Input: n = 2 Output: 2 Explanation: There are two ways to climb to the top. 1. 1 step + 1 step 2. 2 steps
Example 2:
Input: n = 3 Output: 3 Explanation: There are three ways to climb to the top. 1. 1 step + 1 step + 1 step 2. 1 step + 2 steps 3. 2 steps + 1 step
Constraints:
1 <= n <= 45
class Solution:
def climbStairs(self, n: int) -> int:
climbs = {}
climbs[1] = 1
climbs[2] = 2
def climb(n):
if n in climbs:
return climbs[n]
else:
climbs[n] = climb(n-1) + climb(n-2)
return climbs[n]
return climb(n)
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