04 · ALGORITHMS
Python
PythonSudoku Solver
A recursive solver that finds valid Sudoku solutions through backtracking.
THE ALGORITHM
Checks rows, columns and 3×3 boxes, tries a candidate, and backtracks when that choice leads to a dead end.
LOGIC IN PRACTICEConstraints into solutions
The original Python program accepts a grid with zeroes for empty cells and prints a solution when one exists.