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sainsist:
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[2019杭电多校第五场][hdu6630]permutation 2
[2019杭电多校第五场][hdu6624]fraction
[2019杭电多校第五场][hdu6625]three arrays(01字典树)
[2019杭电多校第五场][hdu6628]permutation 1
[2019杭电多校第五场][hdu6629]string matching