1.在使用mp[key]的时候它会去找键值为key的项,假设没有,他会自己主动加入一个key的项,再把value赋值为对应的初始值(value是int的话赋值为0,string的话赋值为空).所以假设是插入的话能够用insert.假设是查找的话能够使用find.这样能够节省开销. 查找的时间复杂度为O(logn) watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/d…

题意: 给出一堆单词,如果有一个单词可以分成左右串两个单词,并且在所给的一堆单词中存在,就是hat词,统计所有这样的词,并按字典序输出. 思路: 注意定义,一个hat词可以被两部分已经存在的词组成,那么也可以是由两个相同的词组成,比如{abcabc,abc} 这样的abcabc也是满足条件的.解法,将所有的单词塞到一个哈希set中,遍历其中每个单词,对每个单词进行任意可能的拆解成两部分,在该set中找,如果两个部分都找到了,那么就成功.塞到另一个set中,最后将set中全部输出.…

Hat’s Words Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7282    Accepted Submission(s): 2639 Problem Description A hat’s word is a word in the dictionary that is the concatenation of exactly…

Hat's Words Time Limit : 2000 / 1000 MS(Java / Others)    Memory Limit : 65536 / 32768 K(Java / Others) Total Submission(s) : 18969    Accepted Submission(s) : 6689 Problem Description A hat's word is a word in the dictionary that is the concatenatio…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1247 Problem DescriptionA hat’s word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary.You are to find all the hat’s words in a dictionary. InputStandard…

题目链接:pid=1247" target="_blank">http://acm.hdu.edu.cn/showproblem.php? pid=1247 Problem Description A hat's word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary. You are to find all the h…

http://acm.hdu.edu.cn/showproblem.php?pid=1247 题意: 给出一些单词,问哪些单词可以正好由其他的两个单词首尾相连而成. 思路: 先将所有单独插入字典树,然后对于每一个单词,枚举它的分割点,去字典树中查找是否具有这两个单词. #include<iostream> #include<cstdio> #include<cstring> using namespace std; +; ]; ; struct Trie { ]; in…

Hat’s Words Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10993    Accepted Submission(s): 3944 Problem Description A hat’s word is a word in the dictionary that is the concatenation of exact…

Hat’s Words Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 13752    Accepted Submission(s): 4919 Problem Description A hat’s word is a word in the dictionary that is the concatenation of exactl…

Hat's Words Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 9574    Accepted Submission(s): 3421 Problem Description A hat's word is a word in the dictionary that is the concatenation of exactl…