Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.
mergeSortRecursive(arr, left, mid); // 排序左半部分
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“脱贫的兜底必须是固若金汤的”
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