[LEET-3396] add 3396

Author: fishercoder1534

paginated_contents/algorithms/4th_thousand/README.md

@@ -1,5 +1,6 @@
 | #    | Title                                                                                                                                                               | Solutions                                                                                                                         | Video                                                                         | Difficulty | Tag                                                                  
 |------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|------------|----------------------------------------------------------------------
+| 3396 | [Minimum Number of Operations to Make Elements in Array Distinct](https://leetcode.com/problems/minimum-number-of-operations-to-make-elements-in-array-distinct/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3396.java) |                                                                               | Easy       |
 | 3370 | [Smallest Number With All Set Bits](https://leetcode.com/problems/smallest-number-with-all-set-bits/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3370.java) |                                                                               | Easy       |
 | 3364 | [Minimum Positive Sum Subarray](https://leetcode.com/problems/minimum-positive-sum-subarray/)                                                                       | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3364.java) |                                                                               | Easy       |
 | 3360 | [Stone Removal Game](https://leetcode.com/problems/stone-removal-game/)                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3360.java) |                                                                               | Easy       |

src/main/java/com/fishercoder/solutions/fourththousand/_3396.java

@@ -0,0 +1,34 @@
+package com.fishercoder.solutions.fourththousand;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class _3396 {
+    public static class Solution1 {
+        public int minimumOperations(int[] nums) {
+            int ops = 0;
+            Map<Integer, Integer> map = new HashMap<>();
+            for (int num : nums) {
+                map.put(num, map.getOrDefault(num, 0) + 1);
+            }
+            int i = 0;
+            while (!allDistinct(map)) {
+                ops++;
+                int target = i + 3;
+                for (; i < target && i < nums.length; i++) {
+                    map.put(nums[i], map.get(nums[i]) - 1);
+                }
+            }
+            return ops;
+        }
+
+        private boolean allDistinct(Map<Integer, Integer> map) {
+            for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
+                if (entry.getValue() > 1) {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+}