HardNo. 2199LeetCode Premium

Finding the Topic of Each Post — LeetCode 2199 Python Solution

Topics
Database
Reading time
3 min

Table schema

SQLTable schema
Table: Keywords +-------------+---------+ | Column Name | Type | +-------------+---------+ | topic_id | int | | word | varchar | +-------------+---------+ (topic_id, word) is the primary key (combination of columns with unique values) for this table. Each row of this table contains the id of a topic and a word that is used to express this topic.

Example

SQLExample
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| topic_id    | int     |
| word        | varchar |
+-------------+---------+
(topic_id, word) is the primary key (combination of columns with unique values) for this table.
Each row of this table contains the id of a topic and a word that is used to express this topic.
There may be more than one word to express the same topic and one word may be used to express multiple topics.

Python solution

PythonSolution
import duckdb
import pandas as pd

def solution(keywords: pd.DataFrame, posts: pd.DataFrame) -> pd.DataFrame:
    con = duckdb.connect()
    con.register("Keywords", keywords)
    con.register("Posts", posts)
    return con.execute("""SELECT
    post_id,
    IFNULL(GROUP_CONCAT(DISTINCT topic_id), 'Ambiguous!') AS topic
FROM
    Posts
    LEFT JOIN Keywords ON INSTR(CONCAT(' ', content, ' '), CONCAT(' ', word, ' ')) > 0
GROUP BY post_id;""").df()

Complexity

Time
O(n log n)(typical)
Space · auxiliary
O(n)

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Frequently asked questions

How hard is LeetCode 2199. Finding the Topic of Each Post?

LeetCode 2199. Finding the Topic of Each Post is rated Hard on LeetCode.

What topics does LeetCode 2199. Finding the Topic of Each Post cover?

LeetCode 2199. Finding the Topic of Each Post is tagged Database on LeetCode.

Is LeetCode 2199. Finding the Topic of Each Post a premium problem?

Yes. LeetCode 2199. Finding the Topic of Each Post is a LeetCode Premium problem, so the full statement and test cases require a paid LeetCode subscription.

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