Valid Ip Addresses InterviewBit Solution

Problem: Valid Ip Addresses

Given a string containing only digits, restore it by returning all possible valid IP address combinations.

A valid IP address must be in the form of A.B.C.D, where A, B, C and D are numbers from 0-255. The numbers cannot be 0 prefixed unless they are 0.

Example:

Given “25525511135”,

return [“255.255.11.135”, “255.255.111.35”]. (Make sure the returned strings are sorted in order)

Brute Force will work, you just have to insert 3 dots in between the string.

Since after each character we can either insert a dot or not. So we have two options for N characters, therefore time complexity is O(2^N).