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 <code>i^th</code> 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 <code>i^th</code> 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:

• <code>1 <= names.length <= 5 * 10⁴</code>

• 1 <= names[i].length <= 20

• names[i] consists of lowercase English letters, digits, and/or round brackets.