Climbing Stairs LeetCode Solution – Queslers

Problem – Climbing Stairs LeetCode Solution

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

Climbing Stairs LeetCode Solution in C++

int climbStairs(int n) {
    int a = 1, b = 1;
    while (n--)
        a = (b += a) - a;
    return a;
}

Climbing Stairs LeetCode Solution in Java

public int climbStairs(int n) {
    int a = 1, b = 1;
    while (n-- > 0)
        a = (b += a) - a;
    return a;
}

Climbing Stairs LeetCode Solution in Python

def climbStairs(self, n):
    a = b = 1
    for _ in range(n):
        a, b = b, a + b
    return a
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