Maximum Area of Triangle!

Given a character matrix of size N x M in the form of a string array A of size N where A[i] denotes i^th row.

Each character in the matrix consists any one of the following three characters {'r', 'g', 'b'} where 'r' denotes red color similarly 'g' denotes green color and 'b' denotes blue color.

You have to find the area of the largest triangle that has one side parallel to y-axis i.e vertical and the color of all three vertices are different.

NOTE:

2 <= N, M <= 10³

A[i][j] = 'r' or A[i][j] = 'g' or A[i][j] = 'b'

First and only argument is an string array A of size N denoting the 2D character matrix.

Return a single integer denoting the area of the largest triangle that has one side parallel to y-axis i.e vertical and the color of all three vertices are different.

If the area comes out to be a real number than return the ceil of that number.

Input 1:

 A = ["rrrrr", "rrrrg", "rrrrr", "bbbbb"]

Input 2:

 A = ["rrr", "rrr", "rrr", "rrr"]

Output 1:

 10

Output 2:

 0

Explanation 1:

 The maximum area of triangle is 10.
 Triangle coordinates are (0,0) containing r, (1,4) containing g, (3,0) containing b.
 

Explanation 2:

 All cells have same color so no triangle possible so we will return 0