README_EN.md

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true	Easy	https://github.com/doocs/leetcode/edit/main/solution/2800-2899/2881.Create%20a%20New%20Column/README_EN.md

2881. Create a New Column

中文文档

Description

DataFrame employees
+-------------+--------+
| Column Name | Type.  |
+-------------+--------+
| name        | object |
| salary      | int.   |
+-------------+--------+

A company plans to provide its employees with a bonus.

Write a solution to create a new column name bonus that contains the doubled values of the salary column.

The result format is in the following example.

 

Example 1:

Input:
DataFrame employees
+---------+--------+
| name    | salary |
+---------+--------+
| Piper   | 4548   |
| Grace   | 28150  |
| Georgia | 1103   |
| Willow  | 6593   |
| Finn    | 74576  |
| Thomas  | 24433  |
+---------+--------+
Output:
+---------+--------+--------+
| name    | salary | bonus  |
+---------+--------+--------+
| Piper   | 4548   | 9096   |
| Grace   | 28150  | 56300  |
| Georgia | 1103   | 2206   |
| Willow  | 6593   | 13186  |
| Finn    | 74576  | 149152 |
| Thomas  | 24433  | 48866  |
+---------+--------+--------+
Explanation: 
A new column bonus is created by doubling the value in the column salary.

Solutions

Solution 1: Direct Calculation

We can directly calculate the double of salary and then store the result in the bonus column.

The time complexity is $O(1)$, and the space complexity is $O(1)$.

Python3

import pandas as pd


def createBonusColumn(employees: pd.DataFrame) -> pd.DataFrame:
    employees['bonus'] = employees['salary'] * 2
    return employees