[Leetcode]937. Reorder Data in Log Files

📄 Description

You are given an array of logs. Each log is a space-delimited string of words, where the first word is the identifier.

There are two types of logs:

• Letter-logs: All words (except the identifier) consist of lowercase English letters.
• Digit-logs: All words (except the identifier) consist of digits.
  Reorder these logs so that:

The letter-logs come before all digit-logs.
The letter-logs are sorted lexicographically by their contents. If their contents are the same, then sort them lexicographically by their identifiers.
The digit-logs maintain their relative ordering.
Return the final order of the logs.

Example 1:

Input: logs = ["dig1 8 1 5 1","let1 art can","dig2 3 6","let2 own kit dig","let3 art zero"]
Output: ["let1 art can","let3 art zero","let2 own kit dig","dig1 8 1 5 1","dig2 3 6"]
Explanation:
The letter-log contents are all different, so their ordering is "art can", "art zero", "own kit dig".
The digit-logs have a relative order of "dig1 8 1 5 1", "dig2 3 6".

Example 2:

Input: logs = ["a1 9 2 3 1","g1 act car","zo4 4 7","ab1 off key dog","a8 act zoo"]
Output: ["g1 act car","a8 act zoo","ab1 off key dog","a1 9 2 3 1","zo4 4 7"]

Constraints:

• 1 <= logs.length <= 100
• 3 <= logs[i].length <= 100
• All the tokens of logs[i] are separated by a single space.
• logs[i] is guaranteed to have an identifier and at least one word after the identifier.

💻 My Submission

class Solution:
    def reorderLogFiles(self, logs: List[str]) -> List[str]:
        digits=[]
        letters=[]
        
        for log in logs:
            if log.split()[1].isdigit():
                digits.append(log)
            else:
                letters.append(log)
        
        # sort letter-logs
        letters.sort(key=lambda x: (x.split()[1:], x.split()[0]))
        
        return letters+digits

💡 What I learned

isdigit() 함수

숫자 여부인지 판별해주는 함수

Referecnes

• https://leetcode.com/problems/reorder-data-in-log-files/
• 파이썬 알고리즘 인터뷰(95가지 알고리즘 문제 풀이로 완성하는 코딩 테스트), 박상길 지음