汝有田舍翁，家资殷盛，而累世不识“之”“乎”。一岁，聘楚士训其子，楚士始训之搦管临朱，书一画，训曰“一”字；书二画，训曰“二”字；书三画，训曰“三”字。其子辄欣欣然，掷笔归告其父曰：“儿得矣，儿得矣；可无烦先生矣，重费馆谷也，请谢去。”其父喜，从之，具币谢遣楚士。
逾时，其父拟征召姻友万氏姓者饮，令子晨起治状，久之不成，父趣之。其子恚曰：“天下姓字伙矣，奈何姓万，自晨至今，才完五百画也。”
初机士偶一解，而即以訑訑自矜有得。殆类是已。
《应谐录》刘元卿
传送：HDU 2141
传送：这里
Problem Description
John has n points on the X axis, and their coordinates are (x[i],0),(i=0,1,2,…,n−1). He wants to know how many pairs<a,b> that |x[b]−x[a]|≤k.(a<b) 继续阅读【尺取法】pairs
There is an island called PiLiPaLa.In the island there is a wild animal living in it, and you can call them PuPu. PuPu is a kind of special animal, infant PuPus play under the sunshine, and adult PuPus hunt near the seaside. They fell happy every day. 继续阅读【思维/快速幂】PUPU
The number n is called a generator of d(n). In the sequence above, 33 is a generator of 39, 39 is a generator of 51, 51 is a generator of 57, and so on. Some numbers have more than one generator: for example, 101 has two generators, 91 and 100. A number with no generators is a self-number. There are thirteen self-numbers less than 100: 1, 3, 5, 7, 9, 20, 31, 42, 53, 64, 75, 86, and 97.
Write a program to output all positive self-numbers less than or equal 1000000 in increasing order, one per line.
这两天因为家里有事跟着家里出门了。在酒店做题好苦涩，等明天回家再把这两天做过的题目写成题解。不得不说，昨天的思维题超级好玩。。但是今天的线段树就emmmm了，写起来挺生疏的，还是得多练习。
另外，这破地方的包车因为人变少了结果只有开学前两天才组织，原来的早班车没有了，，只能晚回学校了。。
学校那还攒着一堆事没处理，还有万恶的两篇读书笔记，qtmd，回去估计要忙上半天，烦。
一回学校估计就要准备五月的省赛了，剩下的这一个多星期，加油加油！
You are an adventurer currently journeying inside an evil temple. After defeating a couple of weak zombies, you arrived at a square room consisting of tiles forming an n × n grid. The rows are numbered 1 through n from top to bottom, and the columns are numbered 1 through n from left to right. At the far side of the room lies a door locked with evil magical forces. The following inscriptions are written on the door:
