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package main
import (
"math"
"sort"
"strings"
"unicode/utf8"
)
const (
runes = 6
words = 6
)
func entropy(s string) (e float64) {
n := make(map[rune]float64)
for _, r := range s {
n[r] += 1 / float64(len(s))
}
for _, v := range n {
e -= v * math.Log2(v)
}
return e
}
func isFlood(s string) bool {
if utf8.RuneCountInString(s) <= runes {
return false
}
if v := strings.Fields(s); len(v) >= words {
return commonWord(v) >= len(v)/2
}
return entropy(s) <= 1
}
func commonWord(v []string) int {
m := make(map[string]int)
for _, w := range v {
m[w]++
}
l := make([]int, len(m))
for _, n := range m {
l = append(l, n)
}
sort.Sort(sort.Reverse(sort.IntSlice(l)))
return l[0]
}
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