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Problem

Submissions

Restore IP Addresses

Contributed by

Shivam Kumar Singh

Medium

0/80

Avg time to solve 15 mins

Success Rate 85 %

18 upvotes

Problem Statement

You are given a string 'S' containing only digits. Your task is to find all possible IP addresses that can be obtained from string 'S' in lexicographical order.

Note:

A valid IP address consists of exactly four integers, each integer is between 0 and 255 separated by single dots, and cannot have leading zeros except in the case of zero itself.

For example:

The following are valid IP addresses:
0.1.24.255
18.5.244.1

Following are invalid IP addresses:
0.01.24.255  (as  01  contains one leading zero).
18.312.244.1 (as 312 not lies between 0 and 255).

Detailed explanation ( Input/output format, Notes, Constraints, Images )

Input format :

The first line of input contains a single integer 'T', representing the number of test cases or queries to be run. 

Then the 'T' test cases follow.

The first line of each test case contains a string 'S'.

Output format :

For each test case, print a single line containing all possible valid IP addresses that can be obtained from 'S' in lexicographical order in a separate line.

Each IP address of a string 'S' is written within quotes("") and separated by comma(,) and space, and all IP addresses of the given string 'S' is written inside square brackets[].

Constraints:

1 <= T <= 1000
1 <= |S| <= 15

Where |'S'| denotes the length of string 'S' and 'S' contains only digits from 0 to 9.

Time Limit: 1 sec

Note:

You do not need to print anything, it has already been taken care of. Just implement the given function.

Sample Input 1 :

2 
2122
23579

Sample Output 1 :

[“2.1.2.2”]
[“2.3.5.79”, “2.3.57.9”, “2.35.7.9”, “23.5.7.9”]

Explanation for sample Input 1:

For the first test case, there is only one possible IP address that is [2.1.2.2]

For the second test case, all possible IP addresses are shown below.
[2.3.5.79], [2.3.57.9], [2.35.7.9], [23.5.7.9]

Sample Input 2 :

2
123
02300

Sample Output 2 :

[]
[“0.2.30.0”, “0.23.0.0”]

Explanation for sample Input 2:

For the first test case, there is no possible IP address. Therefore then answer is []

For the second test case, there are only 2 possible IP addresses are shown below.
[0.2.30.0], [0.23.0.0]

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