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Steffen Vogel 2010-08-17 01:22:40 +02:00
commit ea08c61688
18 changed files with 394 additions and 0 deletions
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18
.classpath Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
<classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v6.0">
<attributes>
<attribute name="owner.project.facets" value="jst.web"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/java-6-sun-1.6.0.15">
<attributes>
<attribute name="owner.project.facets" value="jst.java"/>
</attributes>
</classpathentry>
<classpathentry kind="lib" path="/usr/share/java/servlet-api-2.4.jar"/>
<classpathentry kind="output" path="build/classes"/>
</classpath>

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.project Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>NDameJava</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.wst.jsdt.core.javascriptValidator</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.wst.common.project.facet.core.builder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.wst.validation.validationbuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
<nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
</natures>
</projectDescription>

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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.JRE_CONTAINER"/>
<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.WebProject">
<attributes>
<attribute name="hide" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.baseBrowserLibrary"/>
<classpathentry kind="output" path=""/>
</classpath>

12
.settings/org.eclipse.jdt.core.prefs Normal file
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#Sat Feb 20 21:14:00 CET 2010
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.6
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.source=1.6

3
.settings/org.eclipse.ltk.core.refactoring.prefs Normal file
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#Sat Feb 20 21:14:00 CET 2010
eclipse.preferences.version=1
org.eclipse.ltk.core.refactoring.enable.project.refactoring.history=false

9
.settings/org.eclipse.wst.common.component Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project-modules id="moduleCoreId" project-version="1.5.0">
<wb-module deploy-name="test">
<wb-resource deploy-path="/" source-path="/WebContent"/>
<wb-resource deploy-path="/WEB-INF/classes" source-path="/src"/>
<property name="context-root" value="test"/>
<property name="java-output-path"/>
</wb-module>
</project-modules>

8
.settings/org.eclipse.wst.common.project.facet.core.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<runtime name="Apache Tomcat v6.0"/>
<fixed facet="jst.web"/>
<fixed facet="jst.java"/>
<installed facet="jst.java" version="6.0"/>
<installed facet="jst.web" version="2.4"/>
</faceted-project>

1
.settings/org.eclipse.wst.jsdt.ui.superType.container Normal file
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org.eclipse.wst.jsdt.launching.baseBrowserLibrary

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.settings/org.eclipse.wst.jsdt.ui.superType.name Normal file
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Window

3
.settings/org.eclipse.wst.ws.service.policy.prefs Normal file
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#Sat Feb 20 21:14:00 CET 2010
eclipse.preferences.version=1
org.eclipse.wst.ws.service.policy.projectEnabled=false

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WebContent/META-INF/MANIFEST.MF Normal file
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Manifest-Version: 1.0
Class-Path:

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WebContent/WEB-INF/web.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>test</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

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WebContent/index.jsp Normal file
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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<%@page import="java.util.ArrayList"%><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"></meta>
<title>n-Damen Problem - Backtracking</title>
<link rel="stylesheet" type="text/css" href="schach.css" />
<script src="schach.js" type="text/javascript"></script>
</head>
<body onload="schach(document.getElementById('sols').childNodes[1].value)">
<div id="wrapper">
<div id="header">n-Damen Problem</div>
<%@ page import="de.steffenvogel.ndame.DameArr" %>
<%
int n = (request.getParameter("n") == null) ? 5 : Integer.parseInt(request.getParameter("n"));
if (n > 16) {
out.println("n too large!");
}
else {
long start = System.currentTimeMillis();
DameArr dame = new DameArr(n);
dame.run();
long diff = (System.currentTimeMillis() - start);
%>
F&uuml;r das n-Damen-Problem mit Schachbrettgr&ouml;&szlig;e <%= n %> wurden <%= dame.solcount %> L&ouml;sungen gefunden.<br /><br />
<%
if (n < 14) {
%>
<select id="sols" onchange="schach(this.value)" size="2">
<%
for (int[] solution : dame.getSolutions()) {
String solutionFormatted = new String();
for (Integer i : solution) {
solutionFormatted += (i + 1) + "|";
}
solutionFormatted = solutionFormatted.substring(0, solutionFormatted.length() - 1);
out.println("<option value=\"" + solutionFormatted + "\">" + solutionFormatted + "</option>");
}
%>
</select>
<div id="show">Bitte eine L&ouml;sung w&auml;hlen, um diese anzuzeigen.</div>
<% } %>
<br style="clear:both" />
<br />Dazu wurde folgende Zeit ben&ouml;tigt: <%= diff %> ms.
<% } %>
<form action="index.jsp" method="get">
<span>Schachbrettgr&ouml;&szlig;e = </span><select onchange="submit()" name="n">
<%
for (int i = 1; i < 14; i++) {
out.println("<option" + ((i == n) ? " selected=\"selected\"" : "") + " value=\"" + i + "\">" + i + "</option>");
}
%>
</select>
</form>
<div id="copy">&copy; Steffen Vogel<br />
<a href="mailto:info@steffenvogel.de">info@steffenvogel.de</a><br />
<a href="http://www.steffenvogel.de">http://www.steffenvogel.de</a><br />
Based on Micha's Javascript &amp; CSS frontend</div>
</div>
</body>
</html>

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body {
padding: 10px 0 0 30px;
}
#wrapper {
width: 1050px;
margin: 0 auto;
}
#header {
font-size: 300%;
text-decoration: underline;
text-align: center;
margin-bottom: 10px;
}
#sols {
float: left;
height: 300px
}
#copy {
font-size: 90%;
float: right;
S
}
#show {
float: right;
width: 700px;
}
.show {
background-color: #000;
}
.show td {
text-align: center;
}
.show th {
height: 30px;
background-color: #fff;
width: 50px;
}
.headleft {
background-color: #fff;
width: 30px;
}
.white {
background-color: #fff;
width: 50px;
height: 50px;
}
.black {
background-color: #999;
width: 50px;
height: 50px;
}

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function schach(sol) {
solution = sol.split('|');
n = solution.length;
html = '<table class="show"><tr><td class="headleft"></td>';
for (col = 0; col < n; col++)
html += '<td class="headleft">' + (col + 1) + '</td>';
html += '</tr>';
for (row = 0; row < n; row++) {
html += '<tr><td class="headleft">' + (row + 1) + '</td>';
color = row % 2;
for (col = 0; col < n; col++) {
html += (col % 2) == color ? '<td class="black">' : '<td class="white">';
if (col == solution[row] - 1)
html += '<img src="dame.gif" alt="X" />';
html += '</td>';
}
html += '</tr>';
}
html += '</table>';
document.getElementById('show').innerHTML = html;
}

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build/classes/de/steffenvogel/ndame/DameArr.class Normal file
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src/de/steffenvogel/ndame/DameArr.java Normal file
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package de.steffenvogel.ndame;
import java.util.ArrayList;
public class DameArr {
private int n;
private int row;
private int col;
private ArrayList<int[]> solutions;
private int[][] locked;
private int[] set;
public int solcount = 0;
public DameArr(int n) {
this.n = n;
solutions = new ArrayList<int[]>();
locked = new int[n][n];
set = new int[n];
row = 0;
col = 0;
for (int i = 0; i < n; i++) {
set[i] = -1; // noch keine Dame wurde in diese Zeile gesetzt
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
locked[i][j] = 0;
}
}
}
public void run() {
while (row < n) {
while (col < n) {
if (check(row, col) && col > set[row]) {
set(row, col);
break;
} else {
col++;
}
}
if (col == n) {
if (set[row - 1] >= n - 1 && row == 1)
break;
else
backtrack();
} else {
row++;
col = 0;
if (row == n) {
if (n < 14)
solutions.add(set.clone());
solcount++;
backtrack();
}
}
}
}
private boolean check(int row, int col) {
return (locked[row][col] > 0) ? false : true;
}
private void set(int row, int col) {
for (int i = 0; i < n; i++)
locked[row][i]++; // Vertikal
for (int j = 0; j < n; j++)
locked[j][col]++; // Horizontal
for (int k = 0; k < n; k++)
if ((col - row + k) < n && (col - row + k) >= 0)
locked[k][col - row + k]++; // Diagonal oben links -> unten rechts
for (int l = 0; l < n; l++)
if ((row + col - l) < n && (row + col - l) >= 0)
locked[l][row + col - l]++; // Diagonal unten links -> oben rechts
set[row] = col;
}
void unSet(int row, int col) {
for (int i = 0; i < n; i++)
locked[row][i]--; // Vertikal
for (int j = 0; j < n; j++)
locked[j][col]--; // Horizontal
for (int k = 0; k < n; k++)
if ((col - row + k) < n && (col - row + k) >= 0)
locked[k][col - row + k]--; // Diagonal oben links -> unten rechts
for (int l = 0; l < n; l++)
if ((row + col - l) < n && (row + col - l) >= 0)
locked[l][row + col - l]--; // Diagonal unten links -> oben rechts
set[row] = -1;
}
public ArrayList<int[]> getSolutions() {
return solutions;
}
private void backtrack() {
row--;
col = set[row] + 1;
unSet(row, set[row]);
}
}