Algorithm · Snowflake · Hard
Requirements Input: an N by N board whose squares contain X, O, or nothing. The foundational version uses N = 3, corresponding to standard LC 794. Output: a boolean indicating whether the position could result from legal alternating turns, beginning with X, with no turns taken once either side has already won. The larger-board variant changes only the dimensions: winning means placing K matching marks in sequence, turns still alternate, and X always starts. Notes Important…
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