1233. Remove Sub-Folders from the Filesystem
Given a list of folders folder, return the folders after removing all sub-folders in those folders. You may return the answer in any order.
If a folder[i] is located within another folder[j], it is called a sub-folder of it.
The format of a path is one or more concatenated strings of the form: ‘/‘ followed by one or more lowercase English letters.
- For example, “/leetcode” and “/leetcode/problems” are valid paths while an empty string and “/“ are not.
You are given an array of strings ideas that represents a list of names to be used in the process of naming a company. The process of naming a company is as follows:
- Choose 2 distinct names from ideas, call them ideaA and ideaB.
- Swap the first letters of ideaA and ideaB with each other.
- If both of the new names are not found in the original ideas, then the name ideaA ideaB (the concatenation of ideaA and ideaB, separated by a space) is a valid company name.
- Otherwise, it is not a valid name.
Return the number of distinct valid names for the company.