
Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.
History is littered with hundreds of conflicts over the future of a community, group, location or business that were "resolved" when one of the parties stepped ahead and destroyed what was there. With the original point of contention destroyed, the debates would fall to the wayside. Archive Team believes that by duplicated condemned data, the conversation and debate can continue, as well as the richness and insight gained by keeping the materials. Our projects have ranged in size from a single volunteer downloading the data to a small-but-critical site, to over 100 volunteers stepping forward to acquire terabytes of user-created data to save for future generations.
The main site for Archive Team is at archiveteam.org and contains up to the date information on various projects, manifestos, plans and walkthroughs.
This collection contains the output of many Archive Team projects, both ongoing and completed. Thanks to the generous providing of disk space by the Internet Archive, multi-terabyte datasets can be made available, as well as in use by the Wayback Machine, providing a path back to lost websites and work.
Our collection has grown to the point of having sub-collections for the type of data we acquire. If you are seeking to browse the contents of these collections, the Wayback Machine is the best first stop. Otherwise, you are free to dig into the stacks to see what you may find.
The Archive Team Panic Downloads are full pulldowns of currently extant websites, meant to serve as emergency backups for needed sites that are in danger of closing, or which will be missed dearly if suddenly lost due to hard drive crashes or server failures.
Given an array
A
of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list (including duplicates). For example, if a character occurs 3 times in all strings but not 4 times, you need to include that character three times in the final answer.You may return the answer in any order.
Example 1:
Example 2:
Note:
1 <= A.length <= 100
1 <= A[i].length <= 100
A[i][j]
is a lowercase letter这道题给了一组由小写字母组成的字符串,让返回所有的字符串中的相同的字符,重复的字符要出现对应的次数。其实这道题的核心就是如何判断字符串的相交部分,跟之前的 Intersection of Two Arrays II 和 Intersection of Two Arrays 比较类似。核心是要用 HashMap 建立字符和其出现次数之间的映射,这里由于只有小写字母,所以可以使用一个大小为 26 的数组来代替 HashMap。用一个数组 cnt 来记录相同的字母出现的次数,初始化为整型最大值,然后遍历所有的单词,对于每个单词,新建一个大小为 26 的数组t,并统计每个字符出现的次数,然后遍历0到25各个位置,取 cnt 和 t 对应位置上的较小值来更新 cnt 数组,这样得到就是在所有单词里都出现的字母的个数,最后再把这些字符转为字符串加入到结果 res 中即可,参见代码如下:
Github 同步地址:
#1002
类似题目:
Intersection of Two Arrays II
Intersection of Two Arrays
参考资料:
https://leetcode.com/problems/find-common-characters/
https://leetcode.com/problems/find-common-characters/discuss/247573/C%2B%2B-O(n)-or-O(1)-two-vectors
LeetCode All in One 题目讲解汇总(持续更新中...)
The text was updated successfully, but these errors were encountered: