hotspot/make/test/Queens.java
author nloodin
Fri, 23 Mar 2012 11:02:11 +0100
changeset 12296 cbc9b437292e
parent 5547 f4b087cbb361
permissions -rw-r--r--
7156000: Change makefile to reflect refactored classes Reviewed-by: dholmes
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/*
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 * Copyright (c) 2006, 2008, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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import java.util.*;
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// Copyright 1996, Animorphic Systems
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// gri 28 Aug 92 / 15 Jan 93 / 8 Dec 95
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class Queens {
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  static void try_i(boolean a[], boolean b[], boolean c[], int x[], int i) {
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    int adj = 7;
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    for (int j = 1; j <= 8; j++) {
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      if (b[j] && a[i+j] && c[adj+i-j]) {
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        x[i] = j;
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        b[j] = false;
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        a[i+j] = false;
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        c[adj+i-j] = false;
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        if (i < 8) try_i(a, b, c, x, i+1);
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        else print(x);
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        b[j] = true;
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        a[i+j] = true;
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        c[adj+i-j] = true;
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      }
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    }
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  }
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  public static void main(String s[]) {
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    boolean a[] = new boolean[16+1];
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    boolean b[] = new boolean[ 8+1];
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    boolean c[] = new boolean[14+1];
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    int     x[] = new int[8+1];
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    int adj = 7;
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    for (int i = -7; i <= 16; i++) {
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      if (i >= 1 && i <= 8) b[i]     = true;
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      if (i >= 2)           a[i]     = true;
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      if (i <= 7)           c[adj+i] = true;
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    }
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    x[0] = 0; // solution counter
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    try_i(a, b, c, x, 1);
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  }
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  static void print(int x[]) {
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    // first correct solution: A1 B5 C8 D6 E3 F7 G2 H4
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    char LF = (char)0xA;
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    char CR = (char)0xD;
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    x[0]++;
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    if (x[0] < 10)
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        System.out.print(" ");
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    System.out.print(x[0] + ". ");
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    for (int i = 1; i <= 8; i++) {
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      char p = (char)('A' + i - 1);
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      System.out.print(p);
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      System.out.print (x[i] + " ");
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    }
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    System.out.println();
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  }
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};