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Rev | Author | Line No. | Line |
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14 | daniel-mar | 1 | package de.viathinksoft.immortable.genX; |
2 | |||
3 | import java.io.BufferedReader; |
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4 | import java.io.BufferedWriter; |
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5 | import java.io.File; |
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15 | daniel-mar | 6 | import java.io.FileNotFoundException; |
14 | daniel-mar | 7 | import java.io.FileReader; |
8 | import java.io.FileWriter; |
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9 | import java.io.IOException; |
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15 | daniel-mar | 10 | import java.math.BigInteger; |
14 | daniel-mar | 11 | |
15 | daniel-mar | 12 | /** |
13 | * Immortable Iterator |
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14 | * |
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21 | daniel-mar | 15 | * @author Daniel Marschall, Big thanks to the users of MatheBoard.de |
16 | * @see http://www.matheboard.de/archive/435725/thread.html |
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15 | daniel-mar | 17 | */ |
18 | public class ImmortableNumberSearch { |
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14 | daniel-mar | 19 | |
19 | daniel-mar | 20 | private static final String SIGNATURE = "Immortable Number Report File Version 2.01"; |
27 | daniel-mar | 21 | private static final String SIGNATURE_MINOR = "Iterator GenX Java (100k save-interval, load-integrity-check, int32-r, array-object) r25"; |
15 | daniel-mar | 22 | private static final String END_SIG = "END OF REPORT"; |
14 | daniel-mar | 23 | private static final int SOFTBREAK = 76; |
24 | |||
20 | daniel-mar | 25 | private ByteArray a; |
14 | daniel-mar | 26 | private String filename; |
20 | daniel-mar | 27 | private int saveInterval = 100000; |
15 | daniel-mar | 28 | private int u = -1; |
20 | daniel-mar | 29 | private int r = -1; // FUTURE: r als BigInteger |
15 | daniel-mar | 30 | private String creation_time; |
31 | private String backupDir = "backup"; |
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14 | daniel-mar | 32 | |
27 | daniel-mar | 33 | private static final int INITIAL_SIZE = 1000000; |
34 | private static final int EXPANSION_SIZE = 1000000; |
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35 | |||
15 | daniel-mar | 36 | public ImmortableNumberSearch(String filename) throws LoadException { |
14 | daniel-mar | 37 | this.filename = filename; |
38 | load(); |
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39 | } |
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40 | |||
15 | daniel-mar | 41 | public String getBackupDir() { |
42 | return backupDir; |
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43 | } |
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44 | |||
45 | public void setBackupDir(String backupDir) { |
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46 | this.backupDir = backupDir; |
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47 | } |
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48 | |||
14 | daniel-mar | 49 | public int getSaveInterval() { |
50 | return this.saveInterval; |
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51 | } |
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52 | |||
20 | daniel-mar | 53 | public ByteArray getA() { |
15 | daniel-mar | 54 | return a; |
55 | } |
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56 | |||
57 | public int getU() { |
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58 | return u; |
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59 | } |
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60 | |||
61 | public int getR() { |
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62 | return r; |
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63 | } |
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64 | |||
65 | public String getFilename() { |
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66 | return filename; |
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67 | } |
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68 | |||
14 | daniel-mar | 69 | public void setSaveInterval(int saveInterval) { |
70 | this.saveInterval = saveInterval; |
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71 | } |
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72 | |||
73 | private boolean savePointExists() { |
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74 | return new File(filename).exists(); |
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75 | } |
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76 | |||
15 | daniel-mar | 77 | private void load() throws LoadException { |
78 | if (!savePointExists()) { |
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27 | daniel-mar | 79 | this.a = new ByteArray(INITIAL_SIZE, EXPANSION_SIZE); |
14 | daniel-mar | 80 | return; |
15 | daniel-mar | 81 | } |
14 | daniel-mar | 82 | |
15 | daniel-mar | 83 | BufferedReader f; |
84 | try { |
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85 | f = new BufferedReader(new FileReader(filename)); |
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86 | } catch (FileNotFoundException e) { |
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87 | // Will not happen because of savePointExists(). |
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88 | return; |
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89 | } |
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14 | daniel-mar | 90 | |
20 | daniel-mar | 91 | a.clear(); |
15 | daniel-mar | 92 | u = -1; |
93 | r = -1; |
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94 | |||
95 | try { |
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96 | try { |
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97 | String s = f.readLine(); |
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98 | if (!s.equals(SIGNATURE)) { |
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99 | throw new LoadException("Wrong signature"); |
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100 | } |
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101 | |||
102 | f.readLine(); // Minor. signature |
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103 | f.readLine(); // "" |
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17 | daniel-mar | 104 | |
15 | daniel-mar | 105 | f.readLine(); // "(Starting time)" |
106 | creation_time = f.readLine(); |
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107 | f.readLine(); // "" |
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108 | |||
109 | f.readLine(); // "(Save timestamp)" |
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110 | f.readLine(); // Timestamp |
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111 | f.readLine(); // "" |
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112 | |||
19 | daniel-mar | 113 | f.readLine(); // "(Digits)" |
15 | daniel-mar | 114 | s = f.readLine(); |
20 | daniel-mar | 115 | u = Integer.parseInt(s) - 1; |
15 | daniel-mar | 116 | f.readLine(); // "" |
17 | daniel-mar | 117 | |
15 | daniel-mar | 118 | f.readLine(); // "(r)" |
119 | s = f.readLine(); |
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120 | r = Integer.parseInt(s); // FUTURE: (1) Multi-Line-Support? |
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121 | f.readLine(); // "" |
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122 | |||
27 | daniel-mar | 123 | this.a = new ByteArray(u + 1 + EXPANSION_SIZE, EXPANSION_SIZE); |
124 | |||
24 | daniel-mar | 125 | f.readLine(); // "(M5 reversed)" |
15 | daniel-mar | 126 | do { |
127 | s = f.readLine(); |
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128 | for (int i = 0; i < s.length(); i++) { |
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20 | daniel-mar | 129 | a.add(Byte.parseByte(s.substring(i, i + 1))); |
15 | daniel-mar | 130 | } |
131 | } while (!s.equals("")); |
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132 | |||
20 | daniel-mar | 133 | if (u + 1 != a.count()) { |
15 | daniel-mar | 134 | throw new LoadException( |
135 | "Corrupt: Formal and actual length mismatch!"); |
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136 | } |
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137 | |||
138 | s = f.readLine(); |
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139 | if (!s.equals(END_SIG)) { |
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140 | throw new LoadException("Corrupt: End-signature mismatch."); |
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141 | } |
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142 | } finally { |
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143 | f.close(); |
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144 | } |
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145 | } catch (IOException e) { |
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146 | throw new LoadException(e); |
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14 | daniel-mar | 147 | } |
15 | daniel-mar | 148 | } |
14 | daniel-mar | 149 | |
15 | daniel-mar | 150 | private void save(boolean integrityTest) throws SaveException { |
151 | if (integrityTest) { |
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24 | daniel-mar | 152 | System.out.println("Beginne Selbsttest vor erster Speicherung..."); |
153 | |||
15 | daniel-mar | 154 | if (!integryTest()) { |
23 | daniel-mar | 155 | throw new SaveException( |
156 | "Integrity test failed. (Loaded file broken?) Will not save."); |
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14 | daniel-mar | 157 | } |
15 | daniel-mar | 158 | } |
159 | |||
160 | String timestamp = DateUtils.now("EEE, d MMM yyyy HH:mm:ss Z"); |
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161 | String timestamp_filename = DateUtils.now("dd-MM-yyyy_HH-mm-ss"); |
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17 | daniel-mar | 162 | |
15 | daniel-mar | 163 | try { |
164 | BufferedWriter f = new BufferedWriter(new FileWriter(filename)); |
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14 | daniel-mar | 165 | |
15 | daniel-mar | 166 | try { |
167 | f.write(SIGNATURE + "\r\n"); |
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14 | daniel-mar | 168 | |
15 | daniel-mar | 169 | f.write(SIGNATURE_MINOR + "\r\n"); |
170 | f.write("\r\n"); |
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14 | daniel-mar | 171 | |
15 | daniel-mar | 172 | f.write("(Starting time)\r\n"); |
173 | f.write(creation_time + "\r\n"); |
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174 | f.write("\r\n"); |
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14 | daniel-mar | 175 | |
15 | daniel-mar | 176 | f.write("(Save timestamp)\r\n"); |
177 | f.write(timestamp + "\r\n"); |
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178 | f.write("\r\n"); |
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14 | daniel-mar | 179 | |
19 | daniel-mar | 180 | f.write("(Digits)\r\n"); |
20 | daniel-mar | 181 | f.write((u + 1) + "\r\n"); |
15 | daniel-mar | 182 | f.write("\r\n"); |
14 | daniel-mar | 183 | |
15 | daniel-mar | 184 | f.write("(r)\r\n"); |
185 | f.write(r + "\r\n"); // FUTURE: (1) Multi-Line-Support? |
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14 | daniel-mar | 186 | f.write("\r\n"); |
15 | daniel-mar | 187 | |
24 | daniel-mar | 188 | f.write("(M5 reversed)\r\n"); |
20 | daniel-mar | 189 | int i; |
190 | for (i = 0; i < a.count(); i++) { |
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191 | byte xa = a.get(i); |
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192 | f.write("" + xa); |
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24 | daniel-mar | 193 | if ((i + 1) % SOFTBREAK == 0) { |
15 | daniel-mar | 194 | f.write("\r\n"); |
195 | } |
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196 | } |
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24 | daniel-mar | 197 | if ((i + 1) % SOFTBREAK != 0) { |
15 | daniel-mar | 198 | f.write("\r\n"); |
199 | } |
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200 | f.write("\r\n"); |
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201 | |||
202 | f.write(END_SIG); |
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203 | } finally { |
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204 | f.close(); |
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14 | daniel-mar | 205 | } |
15 | daniel-mar | 206 | } catch (IOException e) { |
207 | throw new SaveException("Could not save master file.", e); |
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14 | daniel-mar | 208 | } |
15 | daniel-mar | 209 | |
210 | // Make backup |
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211 | |||
212 | new File(backupDir).mkdir(); |
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17 | daniel-mar | 213 | String bak_filename = backupDir + "/immortal_" + timestamp_filename |
214 | + "_" + (u + 1) + ".txt"; |
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15 | daniel-mar | 215 | try { |
216 | FileUtils.copyFile(new File(filename), new File(bak_filename)); |
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217 | } catch (IOException e) { |
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218 | throw new SaveException("Could not make backup", e); |
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14 | daniel-mar | 219 | } |
24 | daniel-mar | 220 | |
221 | if (integrityTest) { |
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222 | System.out |
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223 | .println("Erste Speicherung absolviert. Stabile Phase hat begonnen."); |
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224 | } |
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14 | daniel-mar | 225 | } |
226 | |||
15 | daniel-mar | 227 | public void calcIterate(int amount) throws SaveException { |
14 | daniel-mar | 228 | int s, m, k; |
229 | int cnt = 0; |
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230 | |||
15 | daniel-mar | 231 | // Wir führen beim ersten Speichern einen weiteren |
232 | // integrity-Test durch. Grund: Wäre bei einer Fortsetzung einer |
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233 | // Datei das "r" falsch (der Datenteil aber korrekt), dann würde |
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234 | // diese Datei beim Speichern ungültige Daten enthalten (Zahl |
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235 | // nicht immortabel). |
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236 | boolean firstSave = true; |
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237 | |||
20 | daniel-mar | 238 | if (a.isEmpty()) { |
15 | daniel-mar | 239 | creation_time = DateUtils.now("EEE, d MMM yyyy HH:mm:ss Z"); |
20 | daniel-mar | 240 | a.add((byte) 5); |
241 | a.add((byte) 2); |
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14 | daniel-mar | 242 | u = 1; |
243 | r = 2; |
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244 | cnt += 2; |
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245 | } |
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246 | |||
15 | daniel-mar | 247 | do { |
20 | daniel-mar | 248 | r = (r - a.get(u)) / 10 + a.get(u); |
14 | daniel-mar | 249 | s = 0; |
250 | for (m = 1, k = u; m < k; m++, k--) { |
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20 | daniel-mar | 251 | s += a.get(m) * a.get(k); |
14 | daniel-mar | 252 | } |
253 | r += 2 * s; |
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254 | if (m == k) { |
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20 | daniel-mar | 255 | r += a.get(m) * a.get(m); |
14 | daniel-mar | 256 | } |
257 | u++; |
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20 | daniel-mar | 258 | a.add((byte) (r % 10)); |
14 | daniel-mar | 259 | |
17 | daniel-mar | 260 | cnt++; |
14 | daniel-mar | 261 | if (cnt % saveInterval == 0) { |
15 | daniel-mar | 262 | save(firstSave); |
263 | firstSave = false; |
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14 | daniel-mar | 264 | } |
17 | daniel-mar | 265 | } while (cnt != amount); |
14 | daniel-mar | 266 | |
15 | daniel-mar | 267 | // Wir brauchen nicht zwei Mal zu speichern |
17 | daniel-mar | 268 | if (cnt - 1 % saveInterval != 0) { |
15 | daniel-mar | 269 | save(firstSave); |
270 | firstSave = false; |
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271 | } |
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272 | } |
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273 | |||
20 | daniel-mar | 274 | public byte getDigitReverse(int u) { |
275 | return a.get(u); |
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15 | daniel-mar | 276 | } |
277 | |||
278 | public StringBuilder M5_StringBuilder(int u) { |
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279 | StringBuilder s = new StringBuilder(); |
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20 | daniel-mar | 280 | for (int i = 0; i < a.count(); i++) { |
281 | byte xa = a.get(i); |
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282 | s.append("" + xa); |
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15 | daniel-mar | 283 | } |
284 | s.reverse(); |
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285 | return s; |
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286 | } |
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287 | |||
288 | public String M5_String(int u) { |
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289 | return M5_StringBuilder(u).toString(); |
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290 | } |
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291 | |||
292 | public BigInteger M5_BigInteger(int u) { |
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293 | return new BigInteger(M5_String(u)); |
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294 | } |
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295 | |||
296 | public StringBuilder M6_StringBuilder(int u) { |
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297 | StringBuilder s = new StringBuilder(); |
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20 | daniel-mar | 298 | for (int i = 0; i < a.count(); i++) { |
299 | byte xa = a.get(i); |
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24 | daniel-mar | 300 | if (i > 0) { |
301 | s.append("" + (9 - xa)); |
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15 | daniel-mar | 302 | } else { |
24 | daniel-mar | 303 | s.append("" + (11 - xa)); |
14 | daniel-mar | 304 | } |
305 | } |
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15 | daniel-mar | 306 | s.reverse(); |
307 | return s; |
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14 | daniel-mar | 308 | } |
309 | |||
15 | daniel-mar | 310 | public String M6_String(int u) { |
311 | return M6_StringBuilder(u).toString(); |
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312 | } |
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313 | |||
314 | public BigInteger M6_BigInteger(int u) { |
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315 | return new BigInteger(M6_String(u)); |
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316 | } |
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317 | |||
24 | daniel-mar | 318 | protected static boolean isImmortable(BigInteger num, int m) { |
319 | // Alternativ |
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15 | daniel-mar | 320 | // return num.pow(2).toString().endsWith(num.toString()); |
321 | |||
23 | daniel-mar | 322 | // n² === n (mod 10^m) <===> n²%10^m == n%10^m == n |
323 | |||
15 | daniel-mar | 324 | BigInteger m_pow = BigInteger.TEN.pow(m); |
23 | daniel-mar | 325 | return num.pow(2).mod(m_pow).equals(num); |
15 | daniel-mar | 326 | } |
327 | |||
24 | daniel-mar | 328 | protected static boolean isImmortable(BigInteger num) { |
329 | int m = num.toString().length(); |
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330 | return isImmortable(num, m); |
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331 | } |
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332 | |||
15 | daniel-mar | 333 | public boolean integryTest() { |
24 | daniel-mar | 334 | // return isImmortable(M5_BigInteger(u), a.count()); |
335 | return isImmortable(M6_BigInteger(u), a.count()); |
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15 | daniel-mar | 336 | } |
14 | daniel-mar | 337 | } |