add 3146

Author: fishercoder1534

Diff for: paginated_contents/algorithms/4th_thousand/README.md

@@ -39,6 +39,7 @@
 | 3158 | [Find the XOR of Numbers Which Appear Twice](https://leetcode.com/problems/find-the-xor-of-numbers-which-appear-twice/)                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3158.java) |                                                                               | Easy       |
 | 3157 | [Find the Level of Tree with Minimum Sum](https://leetcode.com/problems/find-the-level-of-tree-with-minimum-sum/)                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3157.java) |                                                                               | Medium     |BFS
 | 3151 | [Special Array I](https://leetcode.com/problems/special-array-i/)                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3151.java) |                                                                               | Easy       |
+| 3146 | [Permutation Difference between Two Strings](https://leetcode.com/problems/permutation-difference-between-two-strings/)                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3146.java) |                                                                               | Easy       |
 | 3142 | [Check if Grid Satisfies Conditions](https://leetcode.com/problems/check-if-grid-satisfies-conditions/)                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3142.java) |                                                                               | Easy       |
 | 3131 | [Find the Integer Added to Array I](https://leetcode.com/problems/find-the-integer-added-to-array-i/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3131.java) |                                                                               | Easy       |
 | 3127 | [Make a Square with the Same Color](https://leetcode.com/problems/make-a-square-with-the-same-color/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3127.java) |                                                                               | Easy       |

Diff for: src/main/java/com/fishercoder/solutions/fourththousand/_3146.java

@@ -0,0 +1,20 @@
+package com.fishercoder.solutions.fourththousand;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class _3146 {
+    public static class Solution1 {
+        public int findPermutationDifference(String s, String t) {
+            Map<Character, Integer> map = new HashMap<>();
+            for (int i = 0; i < s.length(); i++) {
+                map.put(s.charAt(i), i);
+            }
+            int sum = 0;
+            for (int i = 0; i < t.length(); i++) {
+                sum += Math.abs(map.get(t.charAt(i)) - i);
+            }
+            return sum;
+        }
+    }
+}