Package g1401_1500.s1487_making_file_names_unique

Class Solution

  • public class Solution
extends Object
    1487 - Making File Names Unique.

    Medium

    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 was 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.

    Example 1:

    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)”

    Example 2:

    Input: names = [“gta”,“gta(1)”,“gta”,“avalon”]

    Output: [“gta”,“gta(1)”,“gta(2)”,“avalon”]

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

    “gta” –> not assigned before, remains “gta”

    “gta(1)” –> not assigned before, remains “gta(1)”

    “gta” –> the name is reserved, system adds (k), since “gta(1)” is also reserved, systems put k = 2. it becomes “gta(2)”

    “avalon” –> not assigned before, remains “avalon”

    Example 3:

    Input: names = [“onepiece”,“onepiece(1)”,“onepiece(2)”,“onepiece(3)”,“onepiece”]

    Output: [“onepiece”,“onepiece(1)”,“onepiece(2)”,“onepiece(3)”,“onepiece(4)”]

    Explanation: When the last folder is created, the smallest positive valid k is 4, and it becomes “onepiece(4)”.

    Constraints:

    • 1 <= names.length <= 5 * 104
    • 1 <= names[i].length <= 20
    • names[i] consists of lowercase English letters, digits, and/or round brackets.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • getFolderNames

        public String[] getFolderNames​(String[] names)