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?
Input: n = 2 Output: 2 Explanation: There are two ways to climb to the top.
- 1 step + 1 step
- 2 steps
Input: n = 3 Output: 3 Explanation: There are three ways to climb to the top.
- 1 step + 1 step + 1 step
- 1 step + 2 steps
- 2 steps + 1 step