Let's solve any Sudoku Problem with our own Sudoku solver ! (Leetcode 37)

Hi everyone, so we will take a look at leetcode problem 37. This is the continuation of our Sudoku series. The first thing that should come to our mind is that this problem is very similar to "N - queens" problems. However, I'll introduce a second approach that makes educated guesses and reduce the number of times we have to backtrack.

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