feat:Adds typescript file

Author: Dasiame

lesson_13/maps_ts/src/lesson13.ts

@@ -3,5 +3,22 @@
  * https://leetcode.com/problems/permutation-difference-between-two-strings
  */
 export function findPermutationDifference(s: string, t: string): number {
-  return 0;
-}
+  const letters = new Map<string,number>();
+    for (let i = 0; i < s.length; i++) {
+      letters.set(s.charAt(i), i);
+    }
+    let permDifferences = 0;
+    for (const key of letters.keys()) {
+      const indexInT = t.indexOf(String(key));
+       permDifferences += Math.abs(s.indexOf(key) - indexInT);
+    }
+    // int sumDifference = 0;
+    // for (int i = 0; i < s.length(); i++) {
+    //   char currentChar = s.charAt(i);
+    //   int indexInT = t.indexOf(currentChar);
+    //   int difference = Math.abs(i - indexInT);
+    //   sumDifference += difference;
+
+    return permDifferences;
+  }
+