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..d4eb8a1c7 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 +1,27 @@
 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[] answer = new int[2 * nums.length];
+
+    for (int i = 0; i < nums.length; i++) {
+      answer[i] = nums[i];
+      answer[i + nums.length] = nums[i];
+    }
+    return answer;
   }
 
-  /**
-   * 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;
+    List answer = new ArrayList();
+    for (int i = 0; i < words.length; i++) {
+      if (words[i].indexOf(x) != -1) {
+        answer.add(i);
+      }
+    }
+    return answer;
   }
 }
diff --git a/lesson_11/arrays_ts/src/lesson11.ts b/lesson_11/arrays_ts/src/lesson11.ts
index 54af1ba03..ab3a367a6 100644
--- a/lesson_11/arrays_ts/src/lesson11.ts
+++ b/lesson_11/arrays_ts/src/lesson11.ts
@@ -1,15 +1,20 @@
-/**
- * Provide the solution to LeetCode 1929 here:
- * https://leetcode.com/problems/concatenation-of-array
- */
+
 export function getConcatenation(nums: number[]): number[] {
-  return [];
+   const answer = new Array(2*nums.length);
+
+   for (let i=0;i<nums.length;i++){
+    answer[i]=nums[i];
+    answer[i+nums.length]=nums[i];
+   }
+   return answer;
 }
 
-/**
- * Provide the solution to LeetCode 2942 here:
- * https://leetcode.com/problems/find-words-containing-character/
- */
 export function findWordsContaining(words: string[], x: string): number[] {
-  return [];
+  const answer = [];
+  for(let i=0;i<words.length;i++){
+    if (words[i].indexOf(x)!=-1){
+      answer.push(i);
+    }
+  }
+  return answer;
 }