Check if Matrix remains unchanged after row reversals in Python

Suppose we have a square matrix. We have to check whether the matrix remains same after performing row reversal operations on each row, or not.

So, if the input is like

then the output will be True

To solve this, we will follow these steps −

• n := row count of matrix
• for i in range 0 to n - 1, do
  • left := 0, right := n - 1
  • while left <= right, do
    • if matrix[i, left] is not same as matrix[i, right], then
      • return False
    • left := left + 1, right := right - 1
• return True

Example

Let us see the following implementation to get better understanding −

 Live Demo

def solve(matrix):
   n = len(matrix)
   for i in range(n):
      left = 0
      right = n - 1
      while left <= right:
         if matrix[i][left] != matrix[i][right]:
            return False
         left += 1
         right -= 1
   return True
matrix = [
         [6,8,6],
         [2,8,2],
         [3,3,3]]
print(solve(matrix))

Input

[
   [6,8,6],
   [2,8,2],
   [3,3,3]]

Output

True

Arnab Chakraborty

Updated on: 19-Jan-2021

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