3174. Clear Digits

Problem Link

Description

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You are given a string s.

Your task is to remove all digits by doing this operation repeatedly:

• Delete the first digit and the closest non-digit character to its left.

Return the resulting string after removing all digits.

 

Example 1:

Input: s = "abc"

Output: "abc"

Explanation:

There is no digit in the string.

Example 2:

Input: s = "cb34"

Output: ""

Explanation:

First, we apply the operation on s[2], and s becomes "c4".

Then we apply the operation on s[1], and s becomes "".

 

Constraints:

• 1 <= s.length <= 100
• s consists only of lowercase English letters and digits.
• The input is generated such that it is possible to delete all digits.

Solution

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Python3

class Solution:
    def clearDigits(self, s: str) -> str:
        stack = []
 
        for x in s:
            if x.isdigit():
                stack.pop()
            else:
                stack.append(x)
        
        return "".join(stack)