Meaninglessnesses
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https://manpages.ubuntu.com/manpages/trusty/man1/pdftocairo.1.html

真好用,PDF to Image

pdftocairo.exe -scale-to 2560 -transp -png pic.pdf

不知道 -transp 为啥不对我起作用……
今晚折腾 AdGuardHome 中……
There is no 16-Clue Sudoku: Solving the Sudoku Minimum Number of Clues Problem via Hitting Set Enumeration
https://arxiv.org/pdf/1201.0749