Question
The smallest period of a string s is the length of the shortest prefix p such that s is formed by repeating p a whole number of times (so "abcabcabc" has smallest period 3, "aaaa" has 1, and "abcd" has 4 because it does not repeat). Return that period length for the given s; for the empty string return 0. The string can be up to 10^5 characters, so brute-forcing every candidate period and verifying it character-by-character may be too slow.
smallest_period(s: str) → int["abcabcabc"]out3State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.