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[POJ 1739] Tony's Tour

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[Codeforces 28D] Do not fear,DravDe is kind

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[Codeforces 23E] Tree

[BZOJ 1926] 粟粟的书架

[BZOJ 2743] 采花

[BZOJ 1911] 特别行动队

[Codeforces 979D] Kuro and GCD and XOR and SUM

[BZOJ 2964] Boss单挑战

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[USACO 2016 Dec Gold] Tutorial

[USACO 2018 Open Gold] Tutorial

[USACO 2018 Jan Gold] Tutorial

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[Codeforces #188] Tutorial

[ZROI #316] ZYB玩字符串

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[Codeforces #196] Tutorial