leetcode : 178. Rank Scores

leetcode : 178. Rank Scores

• [leetcode : 178. Rank Scores]

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다이어그램

erDiagram
    TableName {
        int id
        decimal score
    }

목표

Write a solution to find the rank of the scores. The ranking should be calculated according to the following rules:
The scores should be ranked from the highest to the lowest.
If there is a tie between two scores, both should have the same ranking.
After a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no holes between ranks.
Return the result table ordered by score in descending order.

동일 점수는 같은 등수로 취급해서 점수 내림차순으로 점수랑 랭킹 반환하기

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문제 풀이

MySQL

SELECT
    SCORE,
    DENSE_RANK() OVER (ORDER BY SCORE DESC) AS `RANK`
FROM 
    SCORES

• 기본적인 DENSE_RANK() 사용법을 묻는 문제.

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Pandas

import pandas as pd

def order_scores(scores: pd.DataFrame) -> pd.DataFrame:
    scores['rank'] = scores['score'].rank(method='dense', ascending=False)
    return scores[['score','rank']].sort_values('rank')

• rank(method='dense') + sort_values

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코멘트

• .