Initial data commit

Task/Jaro-similarity/Java/jaro-similarity.java

@@ -0,0 +1,50 @@
+public class JaroDistance {
+    public static double jaro(String s, String t) {
+        int s_len = s.length();
+        int t_len = t.length();
+
+        if (s_len == 0 && t_len == 0) return 1;
+
+        int match_distance = Integer.max(s_len, t_len) / 2 - 1;
+
+        boolean[] s_matches = new boolean[s_len];
+        boolean[] t_matches = new boolean[t_len];
+
+        int matches = 0;
+        int transpositions = 0;
+
+        for (int i = 0; i < s_len; i++) {
+            int start = Integer.max(0, i-match_distance);
+            int end = Integer.min(i+match_distance+1, t_len);
+
+            for (int j = start; j < end; j++) {
+                if (t_matches[j]) continue;
+                if (s.charAt(i) != t.charAt(j)) continue;
+                s_matches[i] = true;
+                t_matches[j] = true;
+                matches++;
+                break;
+            }
+        }
+
+        if (matches == 0) return 0;
+
+        int k = 0;
+        for (int i = 0; i < s_len; i++) {
+            if (!s_matches[i]) continue;
+            while (!t_matches[k]) k++;
+            if (s.charAt(i) != t.charAt(k)) transpositions++;
+            k++;
+        }
+
+        return (((double)matches / s_len) +
+                ((double)matches / t_len) +
+                (((double)matches - transpositions/2.0) / matches)) / 3.0;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(jaro(   "MARTHA",      "MARHTA"));
+        System.out.println(jaro(    "DIXON",    "DICKSONX"));
+        System.out.println(jaro("JELLYFISH",  "SMELLYFISH"));
+    }
+}