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Leetcode Problem 93. Restore IP Addresses

93. Restore IP Addresses

Leetcode Solutions

Backtracking Approach for Generating Valid IP Addresses

  1. Define a helper function that takes the string s, the current index startIndex, a list dots to track the placed dots, and a list ans to store valid IP addresses.
  2. Calculate remainingLength and remainingNumberOfIntegers to determine if further processing is possible.
  3. If only one integer is left to place, check if it's valid and construct the IP address.
  4. Iterate over possible dot positions (1 to 3 digits from the last dot).
  5. Place a dot and call the helper function recursively if the current integer is valid.
  6. Remove the dot (backtrack) and try the next position.
  7. Continue until all combinations are tried or a valid IP address is formed.
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Iterative Approach for Generating Valid IP Addresses

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