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58I_FlipTheWordOrder.go
57 lines (53 loc) · 1.19 KB
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58I_FlipTheWordOrder.go
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package offer
import "strings"
/**
@author: CodeWater
@since: 2023/6/13
@desc: $
**/
/**reverseWords
** @Description: methods a
** @param s
** @return string
**/
func reverseWords(s string) string {
//fields将字符串按空格分割为字符串切片,都不用trim去除空格了
str := strings.Fields(s)
//string不可变,用builder
res := strings.Builder{}
//str[0]直接就是一个单词了. the []string strings.Builder
// fmt.Printf("%v %T %T\n " , str[0] , str , res)
for i := len(str) - 1; i >= 0; i-- {
if str[i] == " " {
continue
}
//追加字符串
res.WriteString(str[i] + " ")
}
return strings.TrimSpace(res.String())
}
/**reverseWords2
** @Description:doublePointer
** @param s
** @return string
**/
func reverseWords2(s string) string {
var res string
i := len(s) - 1
j := i
//双指针:i遍历到单词的首部, j每次更新到单词的尾部
for i >= 0 {
// 去除空格
for i >= 0 && s[i] == ' ' {
i--
}
j = i
//找到单词的首部
for i >= 0 && s[i] != ' ' {
i--
}
//i+1是因为退出上面for的时候i处在空格下标上;j+1是因为切片左闭右开
res = res + s[i+1:j+1] + " "
}
return strings.TrimSpace(res)
}