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LeetCode solutions

1532. Reformat The String

My accepted Python solution to LeetCode problem 1532, Reformat The String, running in 8ms.

  • Difficulty: Easy
  • Python
  • Runtime 8ms
  • Memory 17.3MB

Read the problem on LeetCode View on GitHub

The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.

Python

Accepted on LeetCode — runtime 8ms, memory 17.3MB, accepted 2025-12-29.

python
class Solution:
    def reformat(self, s: str) -> str:
        letters = [c for c in s if c.isalpha()]
        digits = [c for c in s if c.isdigit()]
        
        if abs(len(letters) - len(digits)) > 1:
            return ""
        
        if len(digits) > len(letters):
            letters, digits = digits, letters
        
        result = []
        for i in range(len(digits)):
            result.append(letters[i])
            result.append(digits[i])
        if len(letters) > len(digits):
            result.append(letters[-1])
        
        return ''.join(result)

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