Feat: Lesson-13 PermutationDifference LeetCode

Author: Yafiaha

lesson_13/maps_java/maps_app/src/main/java/com/codedifferently/lesson13/Lesson13.java

@@ -1,12 +1,23 @@
 package com.codedifferently.lesson13;
 
+import java.util.HashMap;
+
 public class Lesson13 {
 
   /**
    * Provide the solution to LeetCode 3146 here:
    * https://leetcode.com/problems/permutation-difference-between-two-strings
    */
   public int findPermutationDifference(String s, String t) {
-    return 0;
+    HashMap<Character, Integer> hashMap = new HashMap<>();
+    int pD = 0;
+    for (int i = 0; i < s.length(); i++) {
+      hashMap.put(s.charAt(i), i);
+    }
+    for (char key : hashMap.keySet()) {
+      int indexT = t.indexOf(Character.toString(key));
+      pD += Math.abs(s.indexOf(key) - indexT);
+    }
+    return pD;
   }
 }