题解 | #字符逆序#

package main

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

func main() {
  reader := bufio.NewReader(os.Stdin)
  str,_ := reader.ReadString('\n')
  // 不知道为啥readline报错
  line := []byte(str)
  if line[len(line)-1] == '\n' {
    line = line[:len(line)-1]
  }
  for i, j := 0, len(line)-1; i < j; i, j =i+1, j-1 {
    line[i], line[j] = line[j], line[i]
  }
  fmt.Println(string(line))
}