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  1. import java.util.ArrayList;
  2. import java.util.Collections;
  3. import java.util.HashMap;
  4. import java.util.HashSet;
  5. import java.util.List;
  6. import java.util.Map;
  7. import java.util.Set;
  8.  
  9.  class MasterMindPP {
  10.  
  11. 	public static Set<String> options = new HashSet<>();
  12.  
  13. 	// Load up permutations
  14. 	public static void loadPossibilities() {
  15. 		for (char c1 = 'a'; c1 <= 'z'; c1++) {
  16. 			for (char c2 = 'a'; c2 <= 'z'; c2++) {
  17. 				for (char c3 = 'a'; c3 <= 'z'; c3++) {
  18. 					for (char c4 = 'a'; c4 <= 'z'; c4++) {
  19. 						for (char c5 = 'a'; c5 <= 'z'; c5++) {
  20. 							options.add(c1 + "" + c2 + "" + c3 + "" + c4 + "" + c5);
  21. 						}
  22. 					}
  23. 				}
  24. 			}
  25. 		}
  26. 		System.out.println(options.size());
  27. 	}
  28.  
  29. 	// Remove all entries that do not yield the same score when matched with
  30. 	// guess / definite wrong anwers.
  31. 	public static void removeMatch(String guess, int score) {
  32. 		Set<String> remove = new HashSet<>();
  33. 		for (String entry : options) {
  34. 			int match = computeMatch(guess, entry);
  35. 			if (score != match)
  36. 				remove.add(entry);
  37. 		}
  38. 		options.removeAll(remove);
  39. 	}
  40.  
  41. 	// Given two strings, match them and return score 10*EXACT_MATCH +
  42. 	// MISMATCHES
  43. 	private static int computeMatch(String guess, String entry) {
  44. 		int exact = 0;
  45. 		int mismatch = 0;
  46. 		for (int i = 0; i < 5; i++) {
  47. 			if (guess.charAt(i) == entry.charAt(i))
  48. 				exact++;
  49. 		}
  50. 		Map<Character, Integer> mapG = mapIt(guess);
  51. 		Map<Character, Integer> mapE = mapIt(entry);
  52. 		for (char c : mapG.keySet()) {
  53. 			mismatch += Math.min(mapG.getOrDefault(c, 0), mapE.getOrDefault(c, 0));
  54. 		}
  55.  
  56. 		return exact * 10 + mismatch - exact;
  57. 	}
  58.  
  59. 	// Given string, count chars
  60. 	private static Map<Character, Integer> mapIt(String guess) {
  61. 		Map<Character, Integer> map = new HashMap<>();
  62. 		for (int i = 0; i < 5; i++) {
  63. 			map.put(guess.charAt(i), 1 + map.getOrDefault(guess.charAt(i), 0));
  64. 		}
  65. 		return map;
  66. 	}
  67.  
  68. 	public static void main(String[] args) {
  69. 		loadPossibilities();
  70. 		String answer = getRandomGuess();
  71.  
  72. 		while (options.size() > 1) {
  73. 			String guess = getRandomGuess();
  74. 			removeMatch(guess, computeMatch(guess, answer));
  75. 			System.out.println(guess + ":" + computeMatch(guess, answer) + ":" + options.size());
  76.  
  77. 		}
  78.  
  79. 	}
  80.  
  81. 	// Return one random string from the options
  82. 	private static String getRandomGuess() {
  83. 		List<String> asList = new ArrayList<>(options);
  84. 		Collections.shuffle(asList);
  85. 		return asList.get(0);
  86. 	}
  87.  
  88. }
  89.  
Time limit exceeded #stdin #stdout 5s 1064516KB
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https://ideone.com/pcOZKt
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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