Package g1601_1700.s1694_reformat_phone_number

Class Solution

java.lang.Object
g1601_1700.s1694_reformat_phone_number.Solution
public class Solution extends java.lang.Object
1694 - Reformat Phone Number.

Easy

You are given a phone number as a string number. number consists of digits, spaces ' ', and/or dashes '-'.

You would like to reformat the phone number in a certain manner. Firstly, remove all spaces and dashes. Then, group the digits from left to right into blocks of length 3 until there are 4 or fewer digits. The final digits are then grouped as follows:

  • 2 digits: A single block of length 2.
  • 3 digits: A single block of length 3.
  • 4 digits: Two blocks of length 2 each.

The blocks are then joined by dashes. Notice that the reformatting process should never produce any blocks of length 1 and produce at most two blocks of length 2.

Return the phone number after formatting.

Example 1:

Input: number = “1-23-45 6”

Output: “123-456”

Explanation: The digits are “123456”.t

Step 1: There are more than 4 digits, so group the next 3 digits. The 1st block is “123”.

Step 2: There are 3 digits remaining, so put them in a single block of length 3. The 2nd block is “456”.

Joining the blocks gives “123-456”.

Example 2:

Input: number = “123 4-567”

Output: “123-45-67”

Explanation: The digits are “1234567”.

Step 1: There are more than 4 digits, so group the next 3 digits. The 1st block is “123”.

Step 2: There are 4 digits left, so split them into two blocks of length 2. The blocks are “45” and “67”.

Joining the blocks gives “123-45-67”.

Example 3:

Input: number = “123 4-5678”

Output: “123-456-78”

Explanation: The digits are “12345678”.

Step 1: The 1st block is “123”.

Step 2: The 2nd block is “456”.

Step 3: There are 2 digits left, so put them in a single block of length 2. The 3rd block is “78”.

Joining the blocks gives “123-456-78”.

Constraints:

  • 2 <= number.length <= 100
  • number consists of digits and the characters '-' and ' '.
  • There are at least two digits in number.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    reformatNumber(java.lang.String number)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • reformatNumber

      public java.lang.String reformatNumber(java.lang.String number)