Feat: Yafiah Lesson_11 extra credit TS solutions

Author: Yafiaha

lesson_11/arrays_ts/src/lesson11.ts

@@ -3,13 +3,29 @@
  * https://leetcode.com/problems/concatenation-of-array
  */
 export function getConcatenation(nums: number[]): number[] {
-  return [];
+  const n = nums.length;
+  const ans: number[] = new Array(2 * n);
+  for (let i = 0; i < n; i++) {
+    ans[i] = nums[i];
+    ans[n + i] = 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 list: number[] = [];
+  for (let i = 0; i < words.length; i++) {
+    const str = words[i];
+    for (let j = 0; j < str.length; j++) {
+      if (str.charAt(j) === x) {
+        list.push(i);
+        break;
+      }
+    }
+  }
+  return list;
 }