1246. Tethered Dog Time limit: 1.0 secondMemory limit: 64 MB A dog is tethered to a pole with a rope. The pole is located inside a fenced polygon (not necessarily convex) with nonzero area. The fence has no self-crosses. The Olympian runs along the f…

1246 丑数 USACO  时间限制: 1 s  空间限制: 128000 KB  题目等级 : 钻石 Diamond 题解  查看运行结果     题目描述 Description 对于一给定的素数集合 S = {p1, p2, ..., pK}, 来考虑那些质因数全部属于S 的数的集合.这个集合包括,p1, p1p2, p1p1, 和 p1p2p3 (还有其它).这是个对于一个输入的S的丑数集合.注意:我们不认为1 是一个丑数.你的工作是对于输入的集合S去寻找集合中的第N个丑数.longi…

引言:硬件中的看门狗,不是门卫的意思,而是一只很凶的狗!如果你不按时喂它,它就会让系统重启!这反而是我们想要的功能~ 1.看门狗概述 看门狗定时器(WDT,Watch Dog Timer)是单片机的一个组成部分,它实际上是一个计数器,一般给看门狗一个数字,程序开始运行后看门狗开始倒计数.如果程序运行正常,过一段时间CPU应发出指令让看门狗复位,重新开始倒计数.如果看门狗减到0就认为程序没有正常工作,强制整个系统复位.因此可以用看门狗防止程序在跑飞的时候回不到正常模式. 看门狗可用于受到电气噪音.…

题目链接 题意:求给定的字符串的最长回文子串 分析:做法是构造一个新的字符串是原字符串+反转后的原字符串(这样方便求两边回文的后缀的最长前缀),即newS = S + '$' + revS,枚举回文串中心位置,RMQ询问LCP = min (height[rank[l]+1] to height[rank[r]]),注意的是RMQ传入参数最好是后缀的位置,因为它们在树上的顺序未知,且左边还要+1. #include <cstdio> #include <algorithm> #in…

2071. Juice Cocktails Time limit: 1.0 secondMemory limit: 64 MB Once n Denchiks come to the bar and each orders a juice cocktail. It could be from 1 to 3 different juices in each cocktail. There are three juices in the bar: apple, banana and pineappl…

2073. Log Files Time limit: 1.0 secondMemory limit: 64 MB Nikolay has decided to become the best programmer in the world! Now he regularly takes part in various programming contests, attentively listens to problems analysis and upsolves problems. But…

2070. Interesting Numbers Time limit: 2.0 secondMemory limit: 64 MB Nikolay and Asya investigate integers together in their spare time. Nikolay thinks an integer is interesting if it is a prime number. However, Asya thinks an integer is interesting i…

2069. Hard Rock Time limit: 1.0 secondMemory limit: 64 MB Ilya is a frontman of the most famous rock band on Earth. Band decided to make the most awesome music video ever for their new single. In that music video Ilya will go through Manhattan standi…

2068. Game of Nuts Time limit: 1.0 secondMemory limit: 64 MB The war for Westeros is still in process, manpower and supplies are coming to an end and the winter is as near as never before. The game of thrones is unpredictable so Daenerys and Stannis…

2067. Friends and Berries Time limit: 2.0 secondMemory limit: 64 MB There is a group of n children. According to a proverb, every man to his own taste. So the children value strawberries and raspberries differently. Let’s say that i-th child rates hi…