题解 | 最小循环节
最小循环节
https://www.nowcoder.com/practice/761f78551b854037abe412c2de615c05
package main
import (
"fmt"
)
func main() {
var str string
fmt.Scan(&str)
m := make(map[rune]struct{}, len(str))
for _,v := range str{
m[v] = struct{}{}
}
fmt.Print(len(m))
}
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