Data commit

Task/Set-consolidation/Java/set-consolidation.java

@@ -0,0 +1,63 @@
+import java.util.*;
+
+public class SetConsolidation {
+
+    public static void main(String[] args) {
+        List<Set<Character>> h1 = hashSetList("AB", "CD");
+        System.out.println(consolidate(h1));
+
+        List<Set<Character>> h2 = hashSetList("AB", "BD");
+        System.out.println(consolidateR(h2));
+
+        List<Set<Character>> h3 = hashSetList("AB", "CD", "DB");
+        System.out.println(consolidate(h3));
+
+        List<Set<Character>> h4 = hashSetList("HIK", "AB", "CD", "DB", "FGH");
+        System.out.println(consolidateR(h4));
+    }
+
+    // iterative
+    private static <E> List<Set<E>>
+                consolidate(Collection<? extends Set<E>> sets) {
+	List<Set<E>> r = new ArrayList<>();
+	for (Set<E> s : sets) {
+	    List<Set<E>> new_r = new ArrayList<>();
+	    new_r.add(s);
+	    for (Set<E> x : r) {
+		if (!Collections.disjoint(s, x)) {
+		    s.addAll(x);
+		} else {
+		    new_r.add(x);
+		}
+	    }
+	    r = new_r;
+	}
+	return r;
+    }
+
+    // recursive
+    private static <E> List<Set<E>> consolidateR(List<Set<E>> sets) {
+        if (sets.size() < 2)
+            return sets;
+        List<Set<E>> r = new ArrayList<>();
+        r.add(sets.get(0));
+        for (Set<E> x : consolidateR(sets.subList(1, sets.size()))) {
+            if (!Collections.disjoint(r.get(0), x)) {
+                r.get(0).addAll(x);
+            } else {
+                r.add(x);
+            }
+        }
+        return r;
+    }
+
+    private static List<Set<Character>> hashSetList(String... set) {
+        List<Set<Character>> r = new ArrayList<>();
+        for (int i = 0; i < set.length; i++) {
+            r.add(new HashSet<Character>());
+            for (int j = 0; j < set[i].length(); j++)
+                r.get(i).add(set[i].charAt(j));
+        }
+        return r;
+    }
+}