feat: adds lesson 11 solutions for Amiyah Jones' extra credit

lesson_11/arrays_ts/src/lesson11.ts

@@ -1,15 +1,23 @@
-/**
- * Provide the solution to LeetCode 1929 here:
- * https://leetcode.com/problems/concatenation-of-array
- */
 export function getConcatenation(nums: number[]): number[] {
-  return [];
+  const n: number = nums.length;
+  const ans: number[] = new Array(2*n);
+
+     for(let i = 0; i < n; i++){
+        ans[i] = nums[i];
+        ans[i + n] = nums[i];
+       }
+
+    return ans;
 }
 
-/**
- * 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 indices: number[] = [];
+
+    for (let i = 0; i < words.length; i++){
+        if(words[i].indexOf(x) >= 0){
+                indices.push(i);
+    }
+}
+
+return indices; 
 }