Climbing Stairs
easyYou 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
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