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卧薪尝胆，厚积薄发。
Common Substrings
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CERC2017 区间
JLOI2013 赛车
HNOI2008 水平可见直线
HNOI2017 影魔
BALTIC2007 序列问题Sequence
HNOI2016 序列
POI2008 PLA-Postering
USACO2006NOV SILVER Bad Hair Day 乱发节
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