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