Python Coding
Challenges

Strings & Text easy

Reverse a string

Return the characters of the string in reverse order.

strings slicing

+5 pts 5m

Strings & Text easy

Palindrome check

Return True if the string reads the same forwards and backwards (ignoring case and non-alphanumeric).

strings two-pointer

+8 pts 8m

Strings & Text easy

Count vowels

Count the number of vowels (a, e, i, o, u) in a string (case-insensitive).

strings counting

+5 pts 5m

Strings & Text easy

Title case converter

Return the string with each word capitalised.

strings split

+5 pts 5m

Strings & Text easy

Anagram check

Return True if two strings are anagrams of each other.

strings sorting counter

+10 pts 10m

Strings & Text medium

Run-length encoding

Compress consecutive identical characters, e.g. 'aaabbc' → 'a3b2c1'.

strings compression

+20 pts 20m

Strings & Text medium

Longest common prefix

Find the longest common prefix among a list of strings.

strings zip

+18 pts 18m

Strings & Text medium

Integer to Roman

Convert a positive integer to its Roman numeral representation.

strings greedy

+22 pts 22m

Strings & Text medium

Zigzag string conversion

Encode a string in zigzag order across numRows rows, then read row by row.

strings math

+22 pts 20m