Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her best friends. She does not want to get to her old home ...
分类:
数据库 时间:
2016-08-22 09:31:36
阅读次数:
303
Problem Sometimes Naive 题目大意 给你一棵n个节点的树,有点权。 要求支持两种操作: 操作1:更改某个节点的权值。 操作2:给定u,v, 求 Σw[i][j] i , j 为任意两点且i到j的路径与u到v的路径相交。 解题分析 容易发现对于一个询问,答案为总点权和的平方 减去 ...
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其他好文 时间:
2016-08-18 06:24:52
阅读次数:
324
The worst solitude is to be destitute of sincere friendship. 最大的孤独莫过于没有真诚的友谊。 Sometimes we pay the most for the things we get nothing, and that moment ...
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其他好文 时间:
2016-08-16 23:47:48
阅读次数:
190
Sometimes some mathematical results are hard to believe. One of the common problems is the birthday paradox. Suppose you are in a party where there ar ...
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其他好文 时间:
2016-08-14 19:21:26
阅读次数:
161
Description Sometimes some mathematical results are hard to believe. One of the common problems is the birthday paradox. Suppose you are in a party wh ...
分类:
其他好文 时间:
2016-08-13 21:01:39
阅读次数:
314
A particular fine spring came around. 转眼又是一番分外明媚的春光。 Hey, it is hot outside, sometimes even unbearable. But you know, the cool and pleasant weather is ...
分类:
其他好文 时间:
2016-08-12 23:25:51
阅读次数:
197
Sometimes its nice to clean up commits before merging them into your main code repo; in this lesson, we go over using git rebase to squash commits tog ...
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其他好文 时间:
2016-08-12 06:45:58
阅读次数:
152
All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes useful to ...
分类:
其他好文 时间:
2016-07-31 14:26:24
阅读次数:
120
Description The word “the” is the most commonthree-letter word. It evenshows up inside other words, suchas “other” and “mathematics”.Sometimes it hide ...
分类:
编程语言 时间:
2016-07-19 17:07:14
阅读次数:
238
Every cloud has a silver lining. 山穷水尽疑无路,柳暗花明又一村。 Every cloud has a silver lining, that just because there is a bright sun behind it. Sometimes we are ...
分类:
其他好文 时间:
2016-07-09 23:39:16
阅读次数:
149