Create 3085. Minimum Deletions to Make String K-Special

3085. Minimum Deletions to Make String K-Special

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+class Solution {
+public:
+    int minimumDeletions(string word, int k) {
+        unordered_map <char,int> freq;
+        for(auto x:word){
+            freq[x]++;
+        }
+        vector<int> storage;
+        for(auto pair: freq){
+            storage.push_back(pair.second);
+        }
+        sort(storage.begin(),storage.end());
+        int n=storage.size();
+        //now we need to check that how many deletion would be needed to make the freq lie in the range of [reference,reference+k] --> so that difference of freq is at most k.
+int min_times=1e5;
+        // for each freq considering it as reference and calcualating deletion
+        for(int i=0;i<n;i++){
+            int ref=storage[i];
+            int deletion=0;
+            // for freq less than reference, deletion of all the characters 
+            for(int j=0;j<i;j++){
+                deletion+=storage[j];
+            }
+            // for freq greater than ref+k we will reduce them exactly to ref+k
+            for(int j=i;j<n;j++){
+                if(storage[j]>ref+k){
+                    deletion+=storage[j]-(ref+k);
+                }
+            }
+            if(deletion<min_times){
+                min_times=deletion;
+            }
+        }
+        return min_times;
+    }
+};