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    如插标卖首耳

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    This person is lazy and didn't join any contests or homework.
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    This person is lazy and didn't write any solutions.
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题目标签

模拟
2
2010
1
2018
1
系统测试
1
LCA
1
NOIp 普及组
1
枚举
1
暴力
1
数论
1
数学
1
递推
1
COCI
1