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..a837dd7fb 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 +1,29 @@
 package com.codedifferently.lesson11;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class Lesson11 {
 
-  /**
-   * Provide the solution to LeetCode 1929 here:
-   * https://leetcode.com/problems/concatenation-of-array
-   */
   public int[] getConcatenation(int[] nums) {
-    return null;
+    int lenOriginalArray = nums.length;
+    int[] concatenatedArrays = new int[lenOriginalArray * 2];
+    int pos = 0;
+
+    System.arraycopy(nums, pos, concatenatedArrays, pos, lenOriginalArray);
+    System.arraycopy(nums, pos, concatenatedArrays, lenOriginalArray, lenOriginalArray);
+    return concatenatedArrays;
   }
 
-  /**
-   * Provide the solution to LeetCode 2942 here:
-   * https://leetcode.com/problems/find-words-containing-character/
-   */
   public List<Integer> findWordsContaining(String[] words, char x) {
-    return null;
+    var indexList = new ArrayList<Integer>(0);
+    int index = 0;
+    for (String word : words) {
+      if (word.indexOf(x) != -1) {
+        indexList.add(index);
+      }
+      index = index + 1;
+    }
+    return indexList;
   }
 }
diff --git a/lesson_11/arrays_ts/src/lesson11.ts b/lesson_11/arrays_ts/src/lesson11.ts
index 54af1ba03..bc32d1093 100644
--- a/lesson_11/arrays_ts/src/lesson11.ts
+++ b/lesson_11/arrays_ts/src/lesson11.ts
@@ -3,7 +3,19 @@
  * https://leetcode.com/problems/concatenation-of-array
  */
 export function getConcatenation(nums: number[]): number[] {
-  return [];
+  if (nums.length === 0) {
+    return [];
+  }
+  const lenOriginalArray: number = nums.length;
+  const concatenatedArrays: number[] = [lenOriginalArray * 2];
+  for (let i = 0; i < lenOriginalArray; i++) {
+    concatenatedArrays[i] = nums[i];
+  }
+  const nextIndex = lenOriginalArray;
+  for (let i = 0; i < lenOriginalArray; i++) {
+    concatenatedArrays[nextIndex + i] = nums[i];
+  }
+  return concatenatedArrays;
 }
 
 /**
@@ -11,5 +23,21 @@ export function getConcatenation(nums: number[]): number[] {
  * https://leetcode.com/problems/find-words-containing-character/
  */
 export function findWordsContaining(words: string[], x: string): number[] {
-  return [];
+  const indexList: number[] = [];
+  if (words.length === 0){
+    return [];
+  }
+  let index = -1;
+  for (const word of words) {
+    index = index + 1;
+    const charactersOfWord = [];
+    const charactersOfCurrentWord: string[] = word.split('');
+    for (const xter of charactersOfCurrentWord) {
+      charactersOfWord.push(xter);
+    }
+    if (charactersOfWord.includes(x)) {
+      indexList.push(index);
+    }
+  }
+  return indexList;
 }