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Codeforces
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Codeforces Round 153 (Div. 1)
2012/12/06 23:30120 分钟251
Codeforces
APoints on LinePoints on Line
1300
仅原文
BPlaying with PermutationsPlaying with Permutations
1800
仅原文
CNumber TransformationNumber Transformation
2000
仅原文
DTwo SetsTwo Sets
2700
仅原文
ETree and TableTree and Table
3000
仅原文