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Java-based LeetCode algorithm problem solutions, regularly updated

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2884\. Modify Columns

Easy

DataFrame `employees` 

    +-------------+--------+ 
    | Column Name | Type   | 
    +-------------+--------+ 
    | name        | object | 
    | salary      | int    | 
    +-------------+--------+

A company intends to give its employees a pay rise.

Write a solution to **modify** the `salary` column by multiplying each salary by 2.

The result format is in the following example.

**Example 1:**

**Input:** DataFrame employees 

    +---------+--------+ 
    | name    | salary | 
    +---------+--------+ 
    | Jack    | 19666  | 
    | Piper   | 74754  | 
    | Mia     | 62509  | 
    | Ulysses | 54866  | 
    +---------+--------+

**Output:** 

    +---------+--------+ 
    | name    | salary | 
    +---------+--------+ 
    | Jack    | 39332  | 
    | Piper   | 149508 | 
    | Mia     | 125018 | 
    | Ulysses | 109732 | 
    +---------+--------+

**Explanation:** Every salary has been doubled.