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C source for a fast backtracking Sudoku solver. Console interface, non-graphic, accepts files with multiple games. Can solve 10,000 Sudokus in under a minute. New version is 5% faster! :)
Solve 9x9 Sudoku Puzzles Using A Command Line Utility
This tool written in C uses the Backtracking algorithm to solve Sudoku puzzles.
The idea was born by participating a coding challenge of a German internet forum.
https://www.coding-board.de/threads/coding-herbst-die-coding-board-de-coding-challenge.39297/
So it's rather made for fun. However, this code won in terms of speed.
Unfortunately, the initiator of the contest has passed away in the meantime.
The LALR parser generator (LPG) is a tool for developing scanners and parsers written in Java, C++ or C. Input is specified by BNF rules. LPG supports backtracking (to resolve ambiguity), automatic AST generation and grammar inheritance.
During a course at University "La Sapienza" in Rome I developed a fully working SAT solver based on unit propagation and backtracking; it can read DIMACS files and process cnf formulas of any length(there are no restrictions on the number of literals).
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CrossBOT is an open source crossword construction system that features an advanced "stand alone" crossword compiler, based on consistency and intelligent backtracking algorithms, along with a web interface.
...Using the DPLL algorithm and reading file in DIMACS format (cnf boolean expression). Tiger Solver use most features of many important sat-solver: - Double watches list - Chronological Backtracking ....