2710. Remove Trailing Zeros From a String

Problem Link

Description

---

Given a positive integer num represented as a string, return the integer num without trailing zeros as a string.

 

Example 1:

Input: num = "51230100"
Output: "512301"
Explanation: Integer "51230100" has 2 trailing zeros, we remove them and return integer "512301".

Example 2:

Input: num = "123"
Output: "123"
Explanation: Integer "123" has no trailing zeros, we return integer "123".

 

Constraints:

• 1 <= num.length <= 1000
• num consists of only digits.
• num doesn't have any leading zeros.

Solution

---

Python3

class Solution:
    def removeTrailingZeros(self, num: str) -> str:
        index = -1
        
        for i, x in enumerate(num):
            if x == "0":
                if index == -1:
                    index = i
            else:
                index = -1
        
        if index == -1: return num
        
        return num[:index]