LeetCode 929. Unique Email Addresses (独特的电子邮件地址)
题目标签:String
题目说明 有两个规则针对于 local name。 所以先把local name 和 domain name 分开。
两个规则是:
rule 1:'.' 会被去除。 (利用replace 把 '.' 换成 '')
rule 2:'+' 之后的所有东西都会被 去除。(利用substring 把 '+' 之后的去除)
Java Solution:
Runtime beats 34.05%
完成日期:12/08/2018
关键点:substring 和 replace
class Solution
{
public int numUniqueEmails(String[] emails)
{
Set<String> set = new HashSet<>(); for(String email : emails)
{
String editedEmail = editEmail(email); set.add(editedEmail); } return set.size();
} private String editEmail(String email)
{
int index = email.indexOf('@');
String str_1 = email.substring(0, index);
String str_2 = email.substring(index); if(str_1.contains("+"))
str_1 = str_1.substring(0, str_1.indexOf('+')); str_1 = str_1.replace(".", ""); return str_1 + str_2;
}
}
参考资料:N/A
LeetCode 题目列表 - LeetCode Questions List
题目来源:https://leetcode.com/
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