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Leetcode 498. Diagonal Traverse

Return the elements of an m×n matrix in diagonal (zigzag) order, alternating between up-right and down-left along each diagonal. The core insight is to group cells by their i+j diagonal index and reverse every other group to produce the alternating traversal while handling boundary lengths.

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Mid October, 2025

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Mid-level

Early October, 2025

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Mid-level

Early October, 2025

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Mid-level

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