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488. Check if given sudoku is valid or not
Problem: Given a filled sudoku, write a program to check if sudoku is valid or following all of its rules.
SUDOKU rules:
 Each column contains all of the digits from 1 to 9 only once.
 Each row contains all of the digits from 1 to 9 only once.
 Each of the nine 3×3 subgrid contains all of the digits from 1 to 9 only once.
Approach:
If we go by the rules of sudoku, we need a function for each rule (row, column and 3x3 matrix). Each function will validate whether all numbers from 1 to 9 are present and there are no duplicates present. There are 9 rows, 9 columns and 9 3x3 matrix, we will validate each of those.
See the code below for more understanding.
Output:
Given SUDOKU is valid