1404. Number of Steps to Reduce a Number in Binary Representation to One

https://leetcode.com/problems/number-of-steps-to-reduce-a-number-in-binary-representation-to-one

Description

Given the binary representation of an integer as a string s, return the number of steps to reduce it to 1 under the following rules:

• If the current number is even, you have to divide it by 2.

• If the current number is odd, you have to add 1 to it.

It is guaranteed that you can always reach one for all test cases.

Example 1:

**Input:** s = "1101"
**Output:** 6
**Explanation:** "1101" corressponds to number 13 in their decimal representation.
Step 1) 13 is odd, add 1 and obtain 14. 
Step 2) 14 is even, divide by 2 and obtain 7.
Step 3) 7 is odd, add 1 and obtain 8.
Step 4) 8 is even, divide by 2 and obtain 4.  
Step 5) 4 is even, divide by 2 and obtain 2. 
Step 6) 2 is even, divide by 2 and obtain 1.  

Example 2:

**Input:** s = "10"
**Output:** 1
**Explanation:** "10" corressponds to number 2 in their decimal representation.
Step 1) 2 is even, divide by 2 and obtain 1.  

Example 3:

**Input:** s = "1"
**Output:** 0

Constraints:

• 1 <= s.length <= 500

• s consists of characters '0' or '1'

• s[0] == '1'

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