econom.go

package main
import(
    "fmt"
)
func search(array []string, s string) bool{
    for i := 0; i < len(array); i++{
        if array[i] == s  {return true}
    }
    return false
}
func main() {
    var s string
    fmt.Scan(&s)
    arr := []rune(s)
    var repeat []string
    var index []int
    for i, elem := range arr{
        if elem == '(' {
            index = append(index,i)
        } else if elem == ')'{
            openInd := index[len(index) - 1]
            index = index[:len(index) - 1]
            slice := string(arr[openInd : i + 1])
            if !search(repeat, slice) {
                repeat = append(repeat,slice)
            }
        }

    }
    fmt.Print(len(repeat))
}