Create Minimum Deletions to Make String K-Special.py

Author: erjan

Minimum Deletions to Make String K-Special.py

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+'''
+You are given a string word and an integer k.
+
+We consider word to be k-special if |freq(word[i]) - freq(word[j])| <= k for all indices i and j in the string.
+
+Here, freq(x) denotes the frequency of the character x in word, and |y| denotes the absolute value of y.
+
+Return the minimum number of characters you need to delete to make word k-special.
+'''
+class Solution:
+    def minimumDeletions(self, word: str, k: int) -> int:
+        freqMap = defaultdict(int)
+        for c in word:
+            freqMap[c] += 1
+        
+        frequencies = sorted(freqMap.values())
+        minDeletions = float('inf')
+        n = len(frequencies)
+        
+        for i in range(n):
+            base = frequencies[i]
+            totalDeletions = 0
+            
+            for j in range(i):
+                totalDeletions += frequencies[j]
+            
+            for j in range(i, n):
+                if frequencies[j] > base + k:
+                    totalDeletions += frequencies[j] - (base + k)
+            
+            if totalDeletions < minDeletions:
+                minDeletions = totalDeletions
+        
+        return minDeletions
+