题解 | #单词倒排#

package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

func main() {
	r := bufio.NewReader(os.Stdin)
	b, _, _ := r.ReadLine()
	s := string(b)

	var flag bool
	var result []rune
	for _, v := range s {
		if !isWord(v) {
			if !flag {
				result = append(result, ' ')
			}
			flag = true
		} else {
			flag = false
			result = append(result, v)
		}

		// a###b -> a#b
	}

	s = string(result)
	ls := strings.Split(s, " ")
	for i := len(ls) - 1; i >= 0; i-- {
		fmt.Printf("%s ", ls[i])
	}
}

func isWord(w rune) bool {
	return (w >= 'A' && w <= 'Z') || (w >= 'a' && w <= 'z')
}