• Explanation: Here, file '1.txt' in 'root/x' and '3.txt' in 'root/y' both have content 'abc', so they are grouped together. Similarly, '2.txt' in 'root/x' and '4.txt' in 'root/y/z' have identical content 'def', so they form another group.
Approach: The approach involves mapping file contents to their file paths and grouping files with identical content.
Observations:
• Files with identical content should be grouped together regardless of their location.
• A hash map can be used to store and retrieve file content efficiently.
Steps:
• 1. Initialize an empty map to store content and file paths.
• 2. Iterate over the given paths and parse directory and file info.
• 3. For each file, extract its content and update the map.
• 4. Filter and return groups with more than one file.
Empty Inputs:
• An empty list of paths.
Large Inputs:
• Handling large file systems with more than 10^4 paths.
Special Values:
• Files with empty content or unique content.
Constraints:
• Make sure to handle files of different sizes efficiently.
Declares the function `findDuplicate` which takes a reference to a vector of file paths as input and returns a vector of vectors containing duplicate file paths.
2 : Variable Initialization (mp)
unordered_map<string, vector<string>> mp;
Initializes an unordered map `mp` where the key is the content of a file and the value is a vector of file paths containing that content.
3 : Variable Initialization (result)
vector<vector<string>> result;
Initializes an empty vector `result` which will store groups of duplicate file paths.
4 : Loop Through Paths
for(autopath: paths) {
Iterates over each file path in the input `paths` vector.
5 : String Stream Setup
stringstream ss(path);
Initializes a stringstream `ss` with the current file path `path` to extract the root and file details.
6 : Root String Initialization
string root;
Declares a string variable `root` to store the root directory of the file.
7 : File String Initialization
string s;
Declares a string variable `s` to store individual file names and their content.
8 : Extract Root Directory
getline(ss, root, ' ');
Extracts the root directory (before the first space) from the stringstream and assigns it to `root`.
9 : Loop Through Files in Directory
while(getline(ss, s, ' ')) {
Iterates over the rest of the file details in the stringstream. Each file is separated by a space.
