HHKB Type-S長時間使用及購買心得

說明一下，買HHKB雖然是我的人生目標，但我一直沒想到我會這麼快就衝了，
畢竟HHKB的鍵位真的需要重新適應，再加上那價格……一個鍵盤就要24840日幣……
用當時接近0.3的匯率來算，大概是快要7500台幣啊……
但因為被同事說我用紅軸打字的聲音太吵，我一怒之下就上網研究了HHKB Type-S跟HHKB BT要怎麼訂購，然後在去年(2016)國慶連假去日本玩的時候就順便一起帶回來了。
所以有的時候計畫趕不上變化，變化比不上同事一句G8話。

(HHKB Type-S整體)

[LeetCode] Happy Number 快樂數字 (No.202)

Write an algorithm to determine if a number is "happy".

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.

Example: 19 is a happy number

• 12 + 92 = 82
• 82 + 22 = 68
• 62 + 82 = 100
• 12 + 02 + 02 = 1

Ref: https://leetcode.com/problems/happy-number/

[LeetCode] Longest Substring Without Repeating Characters 求出不重覆字母下最長的子字串長度 (No.3)

Given a string, find the length of the longest substring without repeating characters.

Examples:

Given "abcabcbb", the answer is "abc", which the length is 3.

Given "bbbbb", the answer is "b", with the length of 1.

Given "pwwkew", the answer is "wke", with the length of 3. Note that the answer must be a substring, "pwke" is a subsequence and not a substring.
Ref: https://leetcode.com/problems/longest-substring-without-repeating-characters/

[Java] 使用JavaMail從GMail寄信以及使用EWS API從Exchange寄信

今天在研究如何使用Java Mail的API從GMail寄信出去，以及使用EWS API從Exchange寄信，寫了一些測試用的Code分享給大家。

一、用JavaMail從GMail寄信
因為GMail講求安全性，所以在Java Mail的設定上會比較複雜， SMTP 伺服器的通訊埠設為 465 (適用 SSL/TLS) 和 587 (適用 STARTTLS)，而在這個例子，我們使用STARTTLS，這個協定就是為了加密從用戶端到伺服器端的連線，會對EMAIL在寄送時更加安全。另外，GMail也有開啟SMTP AUTH的功能，所以我們要得到使用者的帳號密碼才可以寄送。
而如果你有開兩步驟，需要另外建立一個「應用程式密碼」；沒有開兩步驟，則是需要開起「允許安全性較低的應用程式」才能夠正確執行，要不然會報錯。

部份程式碼：

	private static void sendFromGMail(String from, String pass, String[] to,
	String subject, String body) {
	Properties props = System.getProperties();
	String host = "smtp.gmail.com";
	// 下面設定是根據GMail官方文件所寫的，開啟TLS以及SMTP AUTH
	props.put("mail.smtp.starttls.enable", "true");
	props.put("mail.smtp.host", host);
	props.put("mail.smtp.user", from);
	props.put("mail.smtp.password", pass);
	props.put("mail.smtp.port", "587");
	props.put("mail.smtp.auth", "true");
	Session session = Session.getDefaultInstance(props);
	MimeMessage message = new MimeMessage(session);
	try {
	message.setFrom(new InternetAddress(from));
	InternetAddress[] toAddress = new InternetAddress[to.length];
	// To get the array of addresses
	for (int i = 0; i < to.length; i++) {
	toAddress[i] = new InternetAddress(to[i]);
	}
	for (int i = 0; i < toAddress.length; i++) {
	message.addRecipient(Message.RecipientType.TO, toAddress[i]);
	}
	message.setSubject(subject);
	message.setText(body);
	Transport transport = session.getTransport("smtp");
	transport.connect(host, from, pass);
	transport.sendMessage(message, message.getAllRecipients());
	transport.close();
	} catch (AddressException ae) {
	ae.printStackTrace();
	} catch (MessagingException me) {
	me.printStackTrace();
	}
	}

view raw SendFromGMailUsingJavaMailLab.java hosted with ❤ by GitHub

完整程式碼：
https://github.com/jimc1682000/JavaMailLab/blob/master/src/tw/com/jimmy/lab/SendFromGMailUsingJavaMailLab.java

Ref:
http://pclevin.blogspot.tw/2014/11/java-mail-gmail-smtp-server.html
https://support.google.com/mail/answer/78775?hl=zh-Hant

[LeetCode] Add Two Numbers 兩LinkedList相加 (No.2)

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)

Output: 7 -> 0 -> 8

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */

Ref: https://leetcode.com/problems/add-two-numbers/

[LeetCode] Two Sum 兩兩相加 (No.1)

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution.

Example:

Given nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].

UPDATE (2016/2/13):
The return format had been changed to zero-based indices. Please read the above updated description carefully.

Ref: https://leetcode.com/problems/two-sum/

[LeetCode] Excel Sheet Column Number 表單數字翻譯 (No.171)

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

    A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27
    AB -> 28 

Ref: https://leetcode.com/problems/excel-sheet-column-number/