2033 - Minimum Operations to Make a Uni-Value Grid\.

Medium

You are given a 2D integer grid of size m x n and an integer x. In one operation, you can add x to or subtract x from any element in the grid.

A uni-value grid is a grid where all the elements of it are equal.

Return the minimum number of operations to make the grid uni-value. If it is not possible, return -1.

Example 1:

Input: grid = \[\[2,4],6,8], x = 2

Output: 4

Explanation: We can make every element equal to 4 by doing the following:

• Add x to 2 once.

• Subtract x from 6 once.

• Subtract x from 8 twice.

A total of 4 operations were used.

Example 2:

Input: grid = \[\[1,5],2,3], x = 1

Output: 5

Explanation: We can make every element equal to 3.

Example 3:

Input: grid = \[\[1,2],3,4], x = 2

Output: -1

Explanation: It is impossible to make every element equal.

Constraints:

• m == grid.length

• n == grid[i].length

• <code>1 <= m, n <= 10⁵</code>

• <code>1 <= m * n <= 10⁵</code>

• <code>1 <= x, gridj<= 10⁴</code>