LeetCode 1233: Remove Sub-Folders from the Filesystem Solution
Master LeetCode problem 1233 (Remove Sub-Folders from the Filesystem), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1233. Remove Sub-Folders from the Filesystem
Problem Explanation
Explanation
To solve this problem, we can use a hash set to store all the unique folders after removing the sub-folders. We will iterate through the input folders and for each folder, we will check if any of its parent folders are already present in the hash set. If not, we add the folder to the hash set.
Solution Code
class Solution {
public List<String> removeSubfolders(String[] folder) {
Arrays.sort(folder);
Set<String> set = new HashSet<>();
List<String> result = new ArrayList<>();
for (String f : folder) {
boolean isSubFolder = false;
for (int i = 2; i < f.length(); i++) {
if (f.charAt(i) == '/' && set.contains(f.substring(0, i))) {
isSubFolder = true;
break;
}
}
if (!isSubFolder) {
set.add(f);
result.add(f);
}
}
return result;
}
}Try It Yourself
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