题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
package main
import "fmt"
func main() {
var str string
fmt.Scan(&str)
m := make(map[byte]bool)
for i := range str {
if _, ok := m[str[i]]; !ok {
m[str[i]] = true
}
}
fmt.Println(len(m))
}
