Solve Problem 843 - Guess the word

Author: hieu

src/contest/ReadMe.java

@@ -21,7 +21,7 @@ public class ReadMe {
     // heap:                1054[!]     882[!]      864[x]
     // design:              1352[x]     1348[x]     705[v]
     // bit manipulation:    1356[v]     1342[v]     1318[v]
-    // other:               913[x]      1288[v]     843
+    // other:               913[x]      1288[v]     843[x!]
 
 
     // x: not done or give up

src/others/Problem843_GuessWord.java

@@ -0,0 +1,61 @@
+package others;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Problem843_GuessWord {
+
+    interface Master {
+        int guess(String word);
+    }
+
+    public void findSecretWord(String[] wordList, Master master) {
+        // most overlapped word
+        // guess --> matches
+        // find all with matches
+
+        while (true) {
+            String guess = mostOverlappedWord(wordList);
+            int matches = master.guess(guess);
+            if (matches == 6) return;
+            List<String> wordList2 = find(wordList, guess, matches);
+            wordList = wordList2.toArray(new String[0]);
+        }
+    }
+
+    private String mostOverlappedWord(String[] wordList) {
+        int count[][] = new int[6][26], max = 0;
+        for (String w : wordList) {
+            for (int i = 0; i < w.length(); i++) {
+                count[i][w.charAt(i) - 'a']++;
+            }
+        }
+        String res = "";
+        for (String w : wordList) {
+            int score = 0;
+            for (int i = 0; i < w.length(); i++) {
+                score += count[i][w.charAt(i)-'a'];
+            }
+            if (score > max) {
+                max = score;
+                res = w;
+            }
+        }
+        return res;
+    }
+
+    private List<String> find(String[] wordList, String word, int k) {
+        List<String> res = new ArrayList<>();
+        for (String w : wordList) {
+            if (match(word, w) == k) res.add(w);
+        }
+        return res;
+    }
+
+    private int match(String w1, String w2) {
+        int res = 0;
+        for (int i = 0; i < w1.length(); i++)
+            if (w1.charAt(i) == w2.charAt(i)) res++;
+        return res;
+    }
+}