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[ACM] POJ 2418 Hardwood Species (Trie树或者map)
Hardwood SpeciesTime Limit: 10000MS Memory Limit: 65536KTotal Submissions: 17986 Accepted: 7138DescriptionHardwoods are the botanical group of trees that have b原创 2014-07-19 17:35:01 · 2917 阅读 · 0 评论 -
[ACM] hdu 1251 统计难题 (字典树)
统计难题Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131070/65535 K (Java/Others)Total Submission(s): 17416 Accepted Submission(s): 7528Problem DescriptionIgnatius最近遇到一个难题,老师原创 2014-07-18 17:19:42 · 1618 阅读 · 0 评论 -
[ACM] POJ 2513 Colored Sticks (Trie树,欧拉通路,并查集)
Colored SticksTime Limit: 5000MS Memory Limit: 128000KTotal Submissions: 29736 Accepted: 7843DescriptionYou are given a bunch of wooden sticks. Each endpoint of原创 2014-07-18 16:54:24 · 2791 阅读 · 1 评论 -
[ACM] hdu 1671 Phone List (字典树)
Phone ListProblem DescriptionGiven a list of phone numbers, determine if it is consistent in the sense that no number is the prefix of another. Let’s say the phone catalogue listed these n原创 2014-05-25 20:51:32 · 2252 阅读 · 0 评论 -
[ACM] hdu 1251 统计难题 (字典树)
解题思路:这是第一次做字典树的题目。字典树百度百科:又称单词查找树,Trie树,是一种树形结构,是一种哈希树的变种。典型应用是用于统计,排序和保存大量的字符串(但不仅限于字符串),所以经常被搜索引擎系统用于文本词频统计。它的优点是:利用字符串的公共前缀来减少查询时间,最大限度地减少无谓的字符串比较,查询效率比哈希表高。学习了字典树之后,觉得它很明显的就是用空间来换时间,空间复杂度特别大,比原创 2014-05-24 21:00:40 · 3200 阅读 · 0 评论