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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | 4x 4x 4x 20x 6x 14x 4x 20x 10x 10x | export default function duplicateEncode(word: string): string {
const map: Record<string, number> = {}
const normalizedString = word.toLowerCase().split('')
normalizedString.forEach((ch) => {
if (map[ch])
map[ch]++
else map[ch] = 1
})
return normalizedString
.map((ch) => {
if (map[ch] > 1)
return ')'
else return '('
})
.join('')
}
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