Merge pull request neetcode-gh#2998 from benmak11/minimum-freq

Create 1647-minimum-deletions-to-make-character-frequencies-unique.java

Author: MHamiid

java/1647-minimum-deletions-to-make-character-frequencies-unique.java

@@ -0,0 +1,25 @@
+class Solution {
+    public int minDeletions(String s) {
+        int[] chars = new int[26];
+        for (char c : s.toCharArray()) {
+            chars[c - 'a']++;
+        }
+
+        int[] arr = Arrays.stream(chars).boxed()
+                    .sorted(Collections.reverseOrder())
+                    .mapToInt(Integer::intValue)
+                    .toArray();
+        int frequency = arr[0];
+        int res = 0;
+        for (int i : arr) {
+            if (i > frequency) {
+                if (frequency > 0)
+                    res += (i - frequency);
+                else
+                    res += i;
+            }
+            frequency = Math.min(frequency - 1, i - 1);
+        }
+        return res;
+    }
+}