98 lines
2.5 KiB
OCaml
98 lines
2.5 KiB
OCaml
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type peg = Out | Empty | Peg
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let board = [|
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[| Out; Out; Out; Out; Out; Out; Out; Out; Out|];
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[| Out; Out; Out; Peg; Peg; Peg; Out; Out; Out|];
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[| Out; Out; Out; Peg; Peg; Peg; Out; Out; Out|];
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[| Out; Peg; Peg; Peg; Peg; Peg; Peg; Peg; Out|];
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[| Out; Peg; Peg; Peg; Empty; Peg; Peg; Peg; Out|];
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[| Out; Peg; Peg; Peg; Peg; Peg; Peg; Peg; Out|];
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[| Out; Out; Out; Peg; Peg; Peg; Out; Out; Out|];
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[| Out; Out; Out; Peg; Peg; Peg; Out; Out; Out|];
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[| Out; Out; Out; Out; Out; Out; Out; Out; Out|]
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|]
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let print_peg = function
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Out -> print_string "."
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| Empty -> print_string " "
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| Peg -> print_string "$"
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let print_board board =
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for i=0 to 8 do
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for j=0 to 8 do
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print_peg board.(i).(j)
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done;
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print_newline()
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done
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type direction = { dx: int; dy: int }
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let dir = [| {dx = 0; dy = 1}; {dx = 1; dy = 0};
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{dx = 0; dy = -1}; {dx = -1; dy = 0} |]
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type move = { x1: int; y1: int; x2: int; y2: int }
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let moves = Array.new 31 {x1=0;y1=0;x2=0;y2=0}
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let counter = ref 0
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exception Found
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let rec solve m =
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counter := !counter + 1;
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if m = 31 then
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begin match board.(4).(4) with Peg -> true | _ -> false end
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else
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try
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if !counter mod 500 = 0 then begin
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print_int !counter; print_newline()
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end;
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for i=1 to 7 do
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for j=1 to 7 do
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match board.(i).(j) with
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Peg ->
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for k=0 to 3 do
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let d1 = dir.(k).dx in
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let d2 = dir.(k).dy in
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let i1 = i+d1 in
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let i2 = i1+d1 in
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let j1 = j+d2 in
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let j2 = j1+d2 in
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match board.(i1).(j1) with
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Peg ->
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begin match board.(i2).(j2) with
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Empty ->
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(*
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print_int i; print_string ", ";
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print_int j; print_string ") dir ";
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print_int k; print_string "\n";
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*)
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board.(i).(j) <- Empty;
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board.(i1).(j1) <- Empty;
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board.(i2).(j2) <- Peg;
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if solve(m+1) then begin
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moves.(m) <- { x1=i; y1=j; x2=i2; y2=j2 };
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raise Found
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end;
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board.(i).(j) <- Peg;
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board.(i1).(j1) <- Peg;
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board.(i2).(j2) <- Empty
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| _ -> ()
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end
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| _ -> ()
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done
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| _ ->
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()
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done
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done;
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false
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with Found ->
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true
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let _ = if solve 0 then (print_string "\n"; print_board board)
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