Real image compression (JPEG, PNG) uses different techniques (DCT, entropy coding), but quadtrees capture the same principle: spend your bits where the detail is, not uniformly across the whole image.
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* 时间复杂度:O(len1 + len2),空间复杂度:O(len2)(栈+Map的空间),详情可参考旺商聊官方下载
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