题解 | 字符个数统计
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
package main
import (
"bufio"
"fmt"
"os"
)
func main() {
reader := bufio.NewScanner(os.Stdin)
reader.Scan()
input := reader.Text()
m := map[byte]bool{}
n := 0
for i := 0; i < len(input); i ++ {
if !m[input[i]] {
n ++
m[input[i]] = true
}
}
fmt.Print(n)
}
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