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Current File : /proc/self/root/proc/self/root/opt/golang/1.19.4/test/solitaire.go

// build

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test general operation by solving a peg solitaire game.
// A version of this is in the Go playground.
// Don't run it - produces too much output.

// This program solves the (English) peg solitaire board game.
// See also: http://en.wikipedia.org/wiki/Peg_solitaire

package main

const N = 11 + 1 // length of a board row (+1 for newline)

// The board must be surrounded by 2 illegal fields in each direction
// so that move() doesn't need to check the board boundaries. Periods
// represent illegal fields, ● are pegs, and ○ are holes.
var board = []rune(
	`...........
...........
....●●●....
....●●●....
..●●●●●●●..
..●●●○●●●..
..●●●●●●●..
....●●●....
....●●●....
...........
...........
`)

// center is the position of the center hole if there is a single one;
// otherwise it is -1.
var center int

func init() {
	n := 0
	for pos, field := range board {
		if field == '○' {
			center = pos
			n++
		}
	}
	if n != 1 {
		center = -1 // no single hole
	}
}

var moves int // number of times move is called

// move tests if there is a peg at position pos that can jump over another peg
// in direction dir. If the move is valid, it is executed and move returns true.
// Otherwise, move returns false.
func move(pos, dir int) bool {
	moves++
	if board[pos] == '●' && board[pos+dir] == '●' && board[pos+2*dir] == '○' {
		board[pos] = '○'
		board[pos+dir] = '○'
		board[pos+2*dir] = '●'
		return true
	}
	return false
}

// unmove reverts a previously executed valid move.
func unmove(pos, dir int) {
	board[pos] = '●'
	board[pos+dir] = '●'
	board[pos+2*dir] = '○'
}

// solve tries to find a sequence of moves such that there is only one peg left
// at the end; if center is >= 0, that last peg must be in the center position.
// If a solution is found, solve prints the board after each move in a backward
// fashion (i.e., the last board position is printed first, all the way back to
// the starting board position).
func solve() bool {
	var last, n int
	for pos, field := range board {
		// try each board position
		if field == '●' {
			// found a peg
			for _, dir := range [...]int{-1, -N, +1, +N} {
				// try each direction
				if move(pos, dir) {
					// a valid move was found and executed,
					// see if this new board has a solution
					if solve() {
						unmove(pos, dir)
						println(string(board))
						return true
					}
					unmove(pos, dir)
				}
			}
			last = pos
			n++
		}
	}
	// tried each possible move
	if n == 1 && (center < 0 || last == center) {
		// there's only one peg left
		println(string(board))
		return true
	}
	// no solution found for this board
	return false
}

func main() {
	if !solve() {
		println("no solution found")
	}
	println(moves, "moves tried")
}

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