CS-OA cs-vo Faang

Tiktok VO 真题


First Unique Character


A unique character is one that appears only once in a string. Given a string consisting of lowercase English letters only, return the index of the first occurrence of a unique character in the string using 1-based indexing. If the string does not contain any unique character, return -1.


s = "statistics"

The unique characters are [a, c] among which a occurs first. Using 1-based indexing, it is at index 3.

Function Description

Complete the function getUniqueCharacter in the editor below.

getUniqueCharacter has the following parameter(s):

  • string s: a string


  • int: either the 1-based index or -1


  • 1 ≤ length of s ≤ 10^5
  • The string s consists of lowercase English letters only.

Sample Case 0

Sample Input For Custom Testing


Sample Output



The unique characters are [c, k, t, g, m] out of which the character c occurs first, at index 3.


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