Sync

Task/Entropy/Go/entropy.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+    "fmt"
+    "math"
+)
+
+const s = "1223334444"
+
+func main() {
+    m := map[rune]float64{}
+    for _, r := range s {
+        m[r]++
+    }
+    hm := 0.
+    for _, c := range m {
+        hm += c * math.Log2(c)
+    }
+    const l = float64(len(s))
+    fmt.Println(math.Log2(l) - hm/l)
+}