diff --git a/39.combination-sum.java b/39.combination-sum.java
new file mode 100644
index 0000000..b434eac
--- /dev/null
+++ b/39.combination-sum.java
@@ -0,0 +1,42 @@
+/*
+ * @lc app=leetcode id=39 lang=java
+ *
+ * [39] Combination Sum
+ */
+
+// @lc code=start
+class Solution {
+    public List<List<Integer>> combinationSum(int[] candidates, int target) {
+        int[] copyArr = copy(candidates);
+        Arrays.sort(copyArr);
+        List<List<Integer>> combList = new ArrayList<List<Integer>>();
+
+    }
+
+    private void dfsCombinations(int[] arr, int i, int cur, int target, List<Integer> curList, List<List<Integer>> combList) {
+        if(cur > target) {
+            return;
+        } else if (cur == target) {
+            combList.add(copy(curList));
+            return;
+        }
+        // 
+    }
+
+    private List<Integer> copy(List<Integer> comb) {
+        return new ArrayList<Integer>(comb);
+    }
+
+    private int[] copy(int[] arr) {
+        if(arr == null) {
+            return null;
+        }
+        int[] r = new int[arr.length];
+        for(int i = 0; i < arr.length; i++) {
+            r[i] = arr[i];
+        }
+        return r;
+    }
+}
+// @lc code=end
+