HardNo. 2118LeetCode Premium

Build the Equation — LeetCode 2118 Python Solution

Topics
Database
Reading time
5 min

Table schema

SQLTable schema
Table: Terms +-------------+------+ | Column Name | Type | +-------------+------+ | power | int | | factor | int | +-------------+------+ power is the column with unique values for this table. Each row of this table contains information about one term of the equation.

Example

SQLExample
+-------------+------+
| Column Name | Type |
+-------------+------+
| power       | int  |
| factor      | int  |
+-------------+------+
power is the column with unique values for this table.
Each row of this table contains information about one term of the equation.
power is an integer in the range [0, 100].
factor is an integer in the range [-100, 100] and cannot be zero.

Python solution

PythonSolution
import duckdb
import pandas as pd

def solution(terms: pd.DataFrame) -> pd.DataFrame:
    con = duckdb.connect()
    con.register("Terms", terms)
    return con.execute("""WITH
    T AS (
        SELECT
            power,
            CASE power
                WHEN 0 THEN IF(factor > 0, CONCAT('+', factor), factor)
                WHEN 1 THEN CONCAT(
                    IF(factor > 0, CONCAT('+', factor), factor),
                    'X'
                )
                ELSE CONCAT(
                    IF(factor > 0, CONCAT('+', factor), factor),
                    'X^',
                    power
                )
            END AS it
        FROM Terms
    )
SELECT
    CONCAT(GROUP_CONCAT(it ORDER BY power DESC SEPARATOR ""), '=0') AS equation
FROM T;""").df()

Complexity

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

Related problems

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Frequently asked questions

How hard is LeetCode 2118. Build the Equation?

LeetCode 2118. Build the Equation is rated Hard on LeetCode.

What topics does LeetCode 2118. Build the Equation cover?

LeetCode 2118. Build the Equation is tagged Database on LeetCode.

Is LeetCode 2118. Build the Equation a premium problem?

Yes. LeetCode 2118. Build the Equation is a LeetCode Premium problem, so the full statement and test cases require a paid LeetCode subscription.

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