Leetcode 348. Design Tic-Tac-Toe

Implement a Tic-Tac-Toe class for an n×n board that supports making moves and immediately reports whether a player wins; the key challenge is designing state (e.g., per-row, per-column and diagonal counters) to detect a win in O(1) time per move without scanning the whole board.

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Early February, 2025

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