Making File Names Unique

Making File Names Unique

Given an array of strings names of size n. You will create n folders in your file system such that, at the ith minute, you will create a folder with the name names[i].

Since two files cannot have the same name, if you enter a folder name that is previously used, the system will have a suffix addition to its name in the form of (k), where, k is the smallest positive integer such that the obtained name remains unique.

Return an array of strings of length n where ans[i] is the actual name the system will assign to the ith folder when you create it.

Input: names = ["pes","fifa","gta","pes(2019)"]

Output: ["pes","fifa","gta","pes(2019)"]

Explanation: Let's see how the file system creates folder names:

"pes" --> not assigned before, remains "pes"

"fifa" --> not assigned before, remains "fifa"

"gta" --> not assigned before, remains "gta"

"pes(2019)" --> not assigned before, remains "pes(2019)"

class Solution {
public:
    vector<string> getFolderNames(vector<string>& names) {
        unordered_map<string, int> files;
         vector<string> res;
        
        for(int i=0;i<names.size();i++) {
            string cur=names[i];
            
            if(files.find(cur)!=files.end()) {
                int idx=files[cur]+1;
                
                while(true) {
                    
                    string tmp=cur+"("+to_string(idx)+")";
                    
                    if(files.find(tmp)==files.end()) {
                        cur=tmp;
                        break;
                    }
                    else files[cur]++;
                    idx++;
                }
                
            }
            
            files[cur]=0;
            res.push_back(cur);
        }
        return res;
        
    }
};