#+ANKI_DECK: study_deck_02
* TODO 0070. Climbing Stairs :easy:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0070. Climbing Stairs][0070. Climbing Stairs]]
:END:

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:*


#+begin_src
Input: n = 2
Output: 2
Explanation: There are two ways to climb to the top.
1. 1 step + 1 step
2. 2 steps
#+end_src


*Example 2:*


#+begin_src
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
#+end_src


*Constraints:*

 - ~1 <= n <= 45~

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python :lc-problem 70 :lc-lang python3
class Solution:
    def climbStairs(self, n: int) -> int:
#+end_src

** TODO C++
#+begin_src cpp :lc-problem 70
class Solution {
public:
    int climbStairs(int n) {
        
    }
};
#+end_src