diff --git a/lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/Lesson11.java b/lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/Lesson11.java
index 248938a96..6e6326f57 100644
--- a/lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/Lesson11.java
+++ b/lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/Lesson11.java
@@ -1,22 +1,41 @@
 package com.codedifferently.lesson11;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class Lesson11 {
 
   /**
-   * Provide the solution to LeetCode 1929 here:
+   * Solution to LeetCode problem: Concatenation of Array
    * https://leetcode.com/problems/concatenation-of-array
    */
   public int[] getConcatenation(int[] nums) {
-    return null;
+    int size = nums.length;
+
+    int[] result = new int[size * 2];
+
+    for (int i = 0; i < size * 2; i++) {
+      result[i] = nums[i % size];
+    }
+
+    return result;
   }
 
   /**
-   * Provide the solution to LeetCode 2942 here:
+   * Solution to LeetCode problem: Find Words Containing Character
    * https://leetcode.com/problems/find-words-containing-character/
    */
   public List<Integer> findWordsContaining(String[] words, char x) {
-    return null;
+    List<Integer> result = new ArrayList<>();
+
+    String searchChar = String.valueOf(x);
+
+    for (int i = 0; i < words.length; i++) {
+      if (words[i].contains(searchChar)) {
+        result.add(i);
+      }
+    }
+
+    return result;
   }
 }
diff --git a/lesson_11/arrays_ts/src/lesson11.ts b/lesson_11/arrays_ts/src/lesson11.ts
index 54af1ba03..c77def735 100644
--- a/lesson_11/arrays_ts/src/lesson11.ts
+++ b/lesson_11/arrays_ts/src/lesson11.ts
@@ -3,7 +3,7 @@
  * https://leetcode.com/problems/concatenation-of-array
  */
 export function getConcatenation(nums: number[]): number[] {
-  return [];
+  return [...nums, ... nums];
 }
 
 /**
@@ -11,5 +11,7 @@ export function getConcatenation(nums: number[]): number[] {
  * https://leetcode.com/problems/find-words-containing-character/
  */
 export function findWordsContaining(words: string[], x: string): number[] {
-  return [];
+  return words
+    .map((word, index) => (word.includes(x) ? index : -1))
+    .filter(index => index !== -1);
 }