subsets.II

Author: zeroliu

src/subsets/subsets.II.java

@@ -0,0 +1,19 @@
+public class Solution {
+    public List<List<Integer>> subsetsWithDup(int[] num) {
+        Arrays.sort(num);
+        List<List<Integer>> results = new ArrayList<List<Integer>>();
+        results.add(new LinkedList<Integer>());
+        int size = 0;
+        int startIndex = 0;
+        for (int i=0; i<num.length; i++) {
+            startIndex = (i >= 1 && num[i] == num[i-1]) ? size : 0;
+            size = results.size();
+            for (int j=startIndex; j<size; j++) {
+                List<Integer> res = new LinkedList<Integer>(results.get(j));
+                res.add(num[i]);
+                results.add(res);
+            }
+        }
+        return results;
+    }
+}