# LeetCode - 0070. Climbing Stairs
### 題目網址：https://leetcode.com/problems/climbing-stairs/
###### tags: `LeetCode` `Easy` `模擬`

/*
    -LeetCode format-
    Problem: 70. Climbing Stairs
    Difficulty: Easy
    
    by Inversionpeter
*/



class Solution {
public:
    int climbStairs(int n) {
        unsigned first = 1, second = 2, temporary;
        while (--n)
            temporary = first + second, first = second, second = temporary;
        return first;
    }
};