PLSSSS HELP ME WITH THIS PROBLEM

I AM NOT ABLE TO FIGURE OUT THE SOLUTION TO THIS PROBLEM.CAN ANYONE GIVE THE SOLUTION IN C OR C++ PLS I AM JUST A BEGINNER :
Consider an nxn board game with four types of coins red, green, blue and yellow. Given the state of the board with coins in all cells, develop an algorithm and write a C program to check if the same coins are placed in the shape of ‘L’ on the board. The number of cells in the vertical and horizontal line of ‘L’ shape, is same. Red coins are represented by ‘r’, blue coins are represented by ‘b’, green coins are represented by ‘g’ and yellow coins are represented by ‘y’.

For example, given the configuration of a 4 X 4 board with coins as shown below, the program must print ‘Yes’ since the coin ‘r’ is placed in the positions (3,2), (4,2),(4,3),(4,4) form an ‘L’ shape.

b r y r

r r y b

y r b b

b r r r

Input Format

Number of rows

Number of columns

Elements in the matrix(board), given row by row

Output Format

Print Yes or No

Can you provide the link to the problem ?

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