backtracking Directory Reference

## Files

file | graph_coloring.cpp
| prints the assigned colors using Graph Coloring algorithm
file | knight_tour.cpp
| Knight's tour algorithm
file | minimax.cpp
| returns which is the longest/shortest number using minimax algorithm
file | n_queens.cpp
| Eight Queens puzzle
file | n_queens_all_solution_optimised.cpp
| N queens all optimized
file | nqueen_print_all_solutions.cpp
| Eight Queens puzzle, printing all solutions
file | rat_maze.cpp
| Implements <a href="https://www.codesdope.com/blog/article/backtracking-to- solve-a-rat-in-a-maze-c-java-pytho/".
file | sudoku_solve.cpp
| Sudoku Solver algorithm.