Problem D: Evil Straw Warts Live A palindrome is a string of symbols that is equal to itself when reversed. Given an input string, not necessarily a palindrome, compute the number of swaps necessary to transform the string into a palindrome. By  swap…

题目大意:给一个字符串,判断是否能通过交换字母构成回文,如果能,计算所需的最小交换次数. 如果字符串中出现奇数次的字母的个数>1,则不能构成回文.然后...就没思路了...看网上说用贪心的思想先从两端开始考虑,决定两端的字母后再缩小问题范围直至字符串长度<=2.可是看网上的代码都是只考虑了两端字母,而没有考虑其他可能的情况,如mdcfamcda,如果两端都变为m的话需要交换3次,两端都变为a的话需要交换4次,可是如果变为d的话只需要交换两次,但是网上的代码没考虑这种情况竟然AC了,为什么?是测…

这道题目我用了一上午才做出来,还是看的别人的思路,尽管没有看代码做的有点慢.代码能力还是得加强啊.思维 得缜密.不能想当然,要有根据,写上的代码要有精确度.省的以后还得慢慢调试 思路:贪心.每次都查看两端位置上的字母是否相等.若不相等就在里面查找能使他们相等且所需移动位置最少的那 个.然后交换.记录交换的距离,贪心的离最后一个由近及远找与第一个位置相等的.同理贪心从第一个位置找和最 后一个位置相等且离第一个位置近期的. . .感觉这样的方法确实能够,可是并不会证明这样的策略的正确性.. . 代码…

Evil Straw Warts Live Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 1799   Accepted: 523 Description A palindrome is a string of symbols that is equal to itself when reversed. Given an input string, not necessarily a palindrome, comput…

Description A palindrome is a string of symbols that is equal to itself when reversed. Given an input string, not necessarily a palindrome, compute the number of swaps necessary to transform the string into a palindrome. By swap we mean reversing the…

虽然都是算法基础,不过做了之后还是感觉有长进的,前期基础不打好后面学得很艰难的,现在才慢慢明白这个道理. 闲话少说,上VOJ上的专题训练吧:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=40741#overview 1. A UVA 10602 Editor Nottoobad 好像是俄罗斯NOI的题目,题意是给定n个字符串,然后重新安排字符串的顺序,使得最后需要打的字母总数最少.当前单词和前一个单词相同的前面部分可以不用打, 只需打…

题目 Volume 0. Getting Started 开始10055 - Hashmat the Brave Warrior 10071 - Back to High School Physics 10300 - Ecological Premium 458 - The Decoder 494 - Kindergarten Counting Game 414 - Machined Surfaces 490 - Rotating Sentences 445 - Marvelous Mazes…

Evil Straw Warts Live Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 1144   Accepted: 330 Description A palindrome is a string of symbols that is equal to itself when reversed. Given an input string, not necessarily a palindrome, comput…

Omi, Raymondo, Clay and Kimiko are on new adventure- in search of new Shen Gong Wu. But EvilBoy Genius Jack Spicer is also there. Omi and Jack found the Shen Gong Wu at the same time so theyrushed for it but alas they touched it at the same time. The…

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