We are given two 3-digit numbers called S (start) and G (goal), and also a set of 3-digit numbers called forbidden. To solve the puzzle, we want to get from S to G in the fewest possible moves. A move consists of transforming a number into another by adding or subtracting 1 to one of its digits. For example, a move can take you from 123 to 124, or from 953 to 853. Moves are subjects to the following constraints: • You cannot add to the digit 9 or subtract from the digit 0 • You cannot make a move that transforms the current number into one of the forbidden numbers • You cannot change the same digit twice in two successive moves.

Three_digit_puzzel
..................\cal_heuristic.m
..................\check_constraints.m
..................\generate_children.m
..................\order_fringe.m
..................\puzzle.txt
..................\remove_first.m
..................\start.m

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