Sudoku Solver Problem

Sudoku Solver Problem — ExecCode Hard DSA Practice

Solve the Sudoku Solver problem on ExecCode. Free online hard DSA practice in Arrays - Basics. Write and run code in Java, C++, Python — no signup required to run.

Problem description

Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: 1. Each of the digits 1-9 must occur exactly once in each row. 2. Each of the digits 1-9 must occur exactly once in each column. 3. Each of the digits 1-9 must occur exactly once in each of the 9 3x3 sub-boxes of the grid. The '.' character indicates empty cells.

Examples

Input board = [["5", "3", ".", ".", "7", ".", ".", ".", "."], ["6", ".", ".", "1", "9", "5", ".", ".", "."], [".", "9", "8", ".", ".", ".", ".", "6", "."], ["8", ".", ".", ".", "6", ".", ".", ".", "3"], ["4", ".", ".", "8", ".", "3", ".", ".", "1"], ["7", ".", ".", ".", "2", ".", ".", ".", "6"], [".", "6", ".", ".", ".", ".", "2", "8", "."], [".", ".", ".", "4", "1", "9", ".", ".", "5"], [".", ".", ".", ".", "8", ".", ".", "7", "9"]]; Output [["5", "3", "4", "6", "7", "8", "9", "1", "2"], ["6", "7", "2", "1", "9", "5", "3", "4", "8"], ["1", "9", "8", "3", "4", "2", "5", "6", "7"], ["8", "5",…

Constraints

board.length == 9 board[i].length == 9 board[i][j] is a digit or "."

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