William Blake/威廉.布莱克
To see a world in a grain of sand,
And a heaven in a wild fllower,
Hold infinity in the palm of your hand,
And eternity in an hour.
William Blake/威廉.布莱克
To see a world in a grain of sand,
And a heaven in a wild fllower,
Hold infinity in the palm of your hand,
And eternity in an hour.
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给一棵树离线操作;a b z;
题目:http://acm.hdu.edu.cn/showproblem.php?pid=5029题意:给定一棵树,有n个
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