How to Solve Sudoku using Backtracking | Recursion

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NADOS also enables doubt support, career opportunities and contests besides free of charge content for learning. In this video, we discuss how to solve a Sudoku problem where,

1. You are give a partially filled 9*9 2-D array(arr) which represents an incomplete Sudoku state.
2. You are required to assign the digits from 1 to 9 to the empty cells following some rules.
Rule 1 - Digits from 1-9 must occur exactly once in each row.
Rule 2 - Digits from 1-9 must occur exactly once in each column.
Rule 3 - Digits from 1-9 must occur exactly once in each 3x3 sub-array of the given 2D array.

Assumption - The given Sudoku puzzle will have a single unique solution.

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