reverse_only_letters.go 源码
package string
import (
"unicode"
)
// 仅仅翻转字母
func reverseOnlyLetters(S string) string {
runes := []rune(S)
i, j := 0, len(runes)-1
for i < j {
if !unicode.IsLetter(runes[i]) {
i++
} else if !unicode.IsLetter(runes[j]) {
j--
} else {
runes[i], runes[j] = runes[j], runes[i]
i++
j--
}
}
return string(runes)
}