uncommited problems

minimum-deletions-to-make-character-frequencies-unique/sol.go

@@ -0,0 +1,30 @@
+package main
+
+import "sort"
+
+func minDeletions(s string) int {
+	freq := make([]int, 26) // only lower-case english letters
+	for _, chr := range s {
+		freq[chr-'a']++
+	}
+	sort.Ints(freq)
+
+	count, max := 0, len(s)
+	for idx := len(freq) - 1; idx >= 0 && freq[idx] != 0; idx-- {
+		f := freq[idx]
+		if f > max {
+			count += f - max
+			f = max
+		}
+		if f > 0 {
+			max = f - 1
+		} else {
+			max = 0
+		}
+	}
+	return count
+}
+
+func main() {
+	println(minDeletions("bbcebab"))
+}