## Problem An SMS message can be at most 160 characters. If a message is longer, it must be split into parts, each suffixed with `" (X/N)"` where `X` is the part number and `N` is the total number of parts. The suffix counts toward the 160-character limit. Return the list of message segments. ```python def split_sms(message: str) -> list[str]: pass ``` ``` Input: message = "A" * 200 Output: two segments # With N=2, suffix " (1/2)" and " (2/2)" each 6 chars # Usable per part: 160-6=154 chars # Part1: 'A'*154 + ' (1/2)' [160 chars] # Part2: 'A'*46 + ' (2/2)' [52 chars] # Total content: 154+46=200 -> correct Input: message = "Hello" # <= 160 chars Output: ["Hello"] # no suffix needed ``` ## Follow-ups 1. The suffix length depends on `N`, which depends on the split — is there a circular dependency? How do you resolve it? 2. How would you split on word boundaries rather than arbitrary character positions? 3. Extend to handle unicode: some characters are 2 bytes in GSM encoding and count as 2 toward the 160-char limit. 4. What if the suffix format changes to `"[X of N]"` — how does your solution adapt?

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Split SMS: Break a Long Message into Valid SMS Segments

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Problem An SMS message can be at most 160 characters. If a message is longer, it must be split into parts, each suffixed with " (X/N)" where X is the part number and N is the total number of parts. The suffix counts toward the 160-character limit. Return the list of message segments. Follow-ups The suffix length depends on N, which depends on the split — is there a circular dependency? How do you resolve it? How would you split on word boundaries rather than arbitrary character positions? Extend…

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Split SMS: Break a Long Message into Valid SMS Segments

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