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HDU 3038 How Many Answers Are Wrong(种类并查集)
题目链接食物链类似的题,主要是在于转化,a-b的和为s,转换为b比a-1大s。然后并查集存 此节点到根的差。假如x的根为a,y的根为b:b - y = rank[y]a - x = rank[x]y - x = s可以推出b - a = rank[y] - rank[x] + s;并查集 延迟更新什...
分类:其他好文   时间:2014-05-09 18:38:05    阅读次数:213
codechef Popular Rice Recipe题解
Popular Rice Recipe Did you know that there are over 40,000 varieties of Rice in the world ? There are so many dishes that can be prepared with Rice too. A famous chef from Mumbai, Tid Gusto prep...
分类:其他好文   时间:2014-05-07 04:05:46    阅读次数:428
HDU 3038 How Many Answers Are Wrong
http://acm.hdu.edu.cn/showproblem.php?pid=3038 这是一道并查集题目,这并查集感觉好难写,构思花了我很长很长时间,不过打码时间很短。考虑清楚之后明显快多了 #include #include #include #include #include #include #include #define N 200010 using names...
分类:其他好文   时间:2014-05-07 04:03:06    阅读次数:331
LeetCode - Unique Binary Search Trees
题目原文:     Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique BST's. 题目理解...
分类:其他好文   时间:2014-05-06 22:15:57    阅读次数:415
how many does the factorial of n have zero?
n! 末尾有多少个 0 个人信息:就读于燕大本科软件工程专业 目前大三; 本人博客:google搜索“cqs_2012”即可; 个人爱好:酷爱数据结构和算法,希望将来从事算法工作为人民作出自己的贡献; 博客内容:travel the binary tree by level 5 ( from down to top and from left to right ever...
分类:其他好文   时间:2014-05-06 21:19:02    阅读次数:554
there be 句型
there be意思:表示存在或者发生。英文释义:used to show that sth exists or happens如果现在进行时,单数时用is,复数时用are。现在我问你一个问题.How many students in the class room?你怎么回答呢?使用there be...
分类:其他好文   时间:2014-05-04 12:30:46    阅读次数:304
HDU 3038 How Many Answers Are Wrong (带权并查集+区间判断)
HDU 3038 How Many Answers Are Wrong (带权并查集+区间判断)...
分类:其他好文   时间:2014-05-04 09:11:59    阅读次数:301
Let us learn C in Code <11> flowchart while
So many days passed since the last C tutorial about the flowchart, this chapter we will go on  the flowchart and while loops...
分类:其他好文   时间:2014-05-04 09:01:20    阅读次数:307
[数学+dfs] ZOJ 3753 Simple Equation
题目链接: http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=5176 Simple Equation Time Limit: 2 Seconds      Memory Limit: 65536 KB There are many Equations. Some are difficu...
分类:其他好文   时间:2014-05-03 17:47:01    阅读次数:343
codechef Holes in the text 题解
Chef wrote some text on a piece of paper and now he wants to know how many holes are in the text. What is a hole? If you think of the paper as the plane and a letter as a curve on the plane, then each...
分类:其他好文   时间:2014-05-03 15:49:18    阅读次数:412
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