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Restore IP Addresses (medium)
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Problem Statement

Given a string s containing digits only, return a list of string containing the valid ip addresses that can be formed by inserting the dots(.) in between string characters.

A valid IP address consists of four parts, each ranging from 0 to 255, separated by dots. It's important to note that leading zeros in any part of the IP address are not allowed, except for the number 0 itself.

  • For example, "1.1.21.1", and "1.12.1.1" are valid ip addresses, and "1.1.021.1" is invalid ip address.

Examples

  • Example 1:
    • Input: "11211"

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