Each e-mail by a local name and a domain name, separated with the @ symbol.
For example, in [email protected] in, alice is a local name and leetcode.com is the domain name.
In addition to lowercase letters, emails which may also contain '.' Or '+'.
If you add a dot between certain characters in the local name part of the e-mail address in the ( '.'), Then to where the e-mail sent will be forwarded to the same address in the local name without points. For example, " [email protected] " and " [email protected] " will be forwarded to the same email address. (Note that this rule does not apply to the domain name.)
If you add in the local name plus ( '+'), all the content will be the first plus sign behind ignored. This allows some e-mail filters, such as [email protected] will be forwarded to [email protected] . (Again, this rule does not apply to the domain name.)
You can use these two rules at the same time.
Given a list of e-mail emails, we'll send an e-mail to each address list. The actual different address to receive mail how much?
Example:
Input: [ " [email protected] ", " [email protected] ", " [email protected] "]
Output: 2
Explanation: actually received the message that " [email protected] " and " [email protected] ."
Tip:
. 1 <= emails [i] .length <= 100
. 1 <= emails.length <= 100
per blocked emails [i] and only contains an '@' character.
package main
import (
"fmt"
"strings"
)
func numUniqueEmails(emails []string) int {
set := make(map[string]bool)
for _, email := range emails {
strs := strings.Split(email, "@")
ePref := strs[0]
eSuffix := strs[1]
actPref := ""
for _, ich := range ePref {
ch := fmt.Sprintf("%c", ich)
if ch == "+" {
break
}
if ch != "." {
actPref += ch
}
}
set[actPref+"@"+eSuffix] = true
}
return len(set)
}
func main() {
emails := make([]string, 0)
emails = append(emails, "[email protected]", "[email protected]", "[email protected]")
fmt.Println(numUniqueEmails(emails))
}
The following program output,
