题解 | #字符串变形#

package main

import "strings"

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 *
 * @param s string字符串
 * @param n int整型
 * @return string字符串
 */
func trans( s string ,  n int ) string {
    // 分割单词
    words := strings.Split(s, " ")
    // 反转单词
    for i,j := 0, len(words) -1;i < j; i, j = i+1,j-1 {
        words[i],words[j] = words[j],words[i]
    }
    // 反转单词大小写
    for i, word := range words {
        runes := []rune(word)
        for j,ch := range runes {
            if ch >= 'a' && ch <= 'z' {
                runes[j] = ch - 'a' + 'A'
            }else if ch >= 'A' && ch <= 'Z' {
                runes[j] = ch - 'A' + 'a'
            }
        }
        words[i] = string(runes)
    }
    return strings.Join(words," ")
}