diff --git a/leetcode/077-Combination.java b/leetcode/077-Combination.java
new file mode 100644
index 0000000..8330036
--- /dev/null
+++ b/leetcode/077-Combination.java
@@ -0,0 +1,31 @@
+import java.util.*;
+class Solution {
+
+  public static List<List<Integer>> combine(int n, int k) {
+    List<List<Integer>> result = new ArrayList<>();
+    exploreCombinations(n, k, 1, new ArrayList<Integer>(), result);
+    return result;
+  }
+
+  private static void exploreCombinations(int n, int k, int offset,
+                                          List<Integer> snippet,
+                                          List<List<Integer>> result) {
+        if (snippet.size() == k) {
+        result.add(new ArrayList<>(snippet));
+        return;
+    }
+    final int spaceLeftInSnippet = k - snippet.size();
+    for (int i = offset; i <= n && spaceLeftInSnippet <= n - i + 1 ; ++i) {
+        snippet.add(i);
+        exploreCombinations(n, k, i + 1, snippet , result);
+        snippet.remove(snippet.size() - 1);
+    }
+  }
+
+  public static void main(String[] args){
+    Scanner sc=new Scanner(System.in);
+    int n=sc.nextInt();
+    int k=sc.nextInt();
+    combine(n,k);
+  }
+}