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Commit 6e549a1

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Fix run time on 348.
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‎leetcode/medium/348_design_tic-tac-toe.md‎

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## Solution
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- Runtime: O(N)
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- Run-time: O(1)
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- Space: O(N)
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- N = Given N
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This is a fair production code quality example.
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Make sure when you code, you break down your methods else you may fail this question.
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To achieve O(N) run-time, we can use a summation system for each row, column and the two diagonals.

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