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习题链接：LeetCode 402. 移掉 K 位数字，详情可参考im钱包官方下载
。91视频对此有专业解读
build-index renders all 1,418 source characters and 34 target characters as 48x48 greyscale PNGs, one per font that natively contains the character. Fontconfig is queried per-character to avoid brute-force rendering across all 230 fonts (97% reduction: 8,881 targeted renders vs 326,140 brute-force).，这一点在heLLoword翻译官方下载中也有详细论述
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