First Repeat Characters in a String | Dataford Interview Questions

Find the first repeat characters in the given string and return the index.

Implement first_repeated_index(s) for a string s. Return the index of the first occurrence of the character whose second occurrence is encountered earliest while scanning left to right. Return -1 if every character is unique.

Function signature: def first_repeated_index(s): Input is a string, and output is an integer.

Constraints

0 <= len(s) <= 100000
s may contain any valid Unicode characters
Return the first occurrence index of the character whose repeat is encountered earliest
Return -1 when no character repeats

Function Signature

def first_repeated_index(s):

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Problem

Find the first repeat characters in the given string and return the index.

Function signature: def first_repeated_index(s): Input is a string, and output is an integer.

Constraints

0 <= len(s) <= 100000
s may contain any valid Unicode characters
Return the first occurrence index of the character whose repeat is encountered earliest
Return -1 when no character repeats

Function Signature

def first_repeated_index(s):

Your question is First Repeat Characters in a String. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.