Class Solution
java.lang.Object
g1601_1700.s1694_reformat_phone_number.Solution
1694 - Reformat Phone Number.<p>Easy</p>
<p>You are given a phone number as a string <code>number</code>. <code>number</code> consists of digits, spaces <code>' '</code>, and/or dashes <code>'-'</code>.</p>
<p>You would like to reformat the phone number in a certain manner. Firstly, <strong>remove</strong> all spaces and dashes. Then, <strong>group</strong> the digits from left to right into blocks of length 3 <strong>until</strong> there are 4 or fewer digits. The final digits are then grouped as follows:</p>
<ul>
<li>2 digits: A single block of length 2.</li>
<li>3 digits: A single block of length 3.</li>
<li>4 digits: Two blocks of length 2 each.</li>
</ul>
<p>The blocks are then joined by dashes. Notice that the reformatting process should <strong>never</strong> produce any blocks of length 1 and produce <strong>at most</strong> two blocks of length 2.</p>
<p>Return <em>the phone number after formatting.</em></p>
<p><strong>Example 1:</strong></p>
<p><strong>Input:</strong> number = “1-23-45 6”</p>
<p><strong>Output:</strong> “123-456”</p>
<p><strong>Explanation:</strong> The digits are “123456”.t</p>
<p>Step 1: There are more than 4 digits, so group the next 3 digits. The 1st block is “123”.</p>
<p>Step 2: There are 3 digits remaining, so put them in a single block of length 3. The 2nd block is “456”.</p>
<p>Joining the blocks gives “123-456”.</p>
<p><strong>Example 2:</strong></p>
<p><strong>Input:</strong> number = “123 4-567”</p>
<p><strong>Output:</strong> “123-45-67”</p>
<p><strong>Explanation:</strong> The digits are “1234567”.</p>
<p>Step 1: There are more than 4 digits, so group the next 3 digits. The 1st block is “123”.</p>
<p>Step 2: There are 4 digits left, so split them into two blocks of length 2. The blocks are “45” and “67”.</p>
<p>Joining the blocks gives “123-45-67”.</p>
<p><strong>Example 3:</strong></p>
<p><strong>Input:</strong> number = “123 4-5678”</p>
<p><strong>Output:</strong> “123-456-78”</p>
<p><strong>Explanation:</strong> The digits are “12345678”.</p>
<p>Step 1: The 1st block is “123”.</p>
<p>Step 2: The 2nd block is “456”.</p>
<p>Step 3: There are 2 digits left, so put them in a single block of length 2. The 3rd block is “78”.</p>
<p>Joining the blocks gives “123-456-78”.</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>2 <= number.length <= 100</code></li>
<li><code>number</code> consists of digits and the characters <code>'-'</code> and <code>' '</code>.</li>
<li>There are at least <strong>two</strong> digits in <code>number</code>.</li>
</ul>
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Constructor Summary
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Method Summary
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Constructor Details
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Solution
public Solution()
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Method Details
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reformatNumber
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