Python Coding
Challenges

Strings & Text easy

Anagram check

Return True if two strings are anagrams of each other.

strings sorting counter

+10 pts 10m

Lists & Arrays easy

Remove duplicates (sorted)

Return a sorted list with duplicates removed.

arrays two-pointer

+10 pts 10m

Lists & Arrays easy

Merge two sorted arrays

Merge two sorted arrays into one sorted array.

arrays merge two-pointer

+12 pts 12m

Lists & Arrays medium

Merge intervals

Merge all overlapping intervals and return a sorted result.

intervals sort

+30 pts 26m

Dicts & Sets medium

Group anagrams

Group words that are anagrams of each other.

dict sorting strings

+22 pts 20m

Data Structures & Algorithms medium

Quicksort

Implement quicksort and return a sorted list.

sorting recursion divide-and-conquer

+25 pts 25m

Data Structures & Algorithms hard

Topological sort (Kahn)

Return a valid topological ordering of tasks, or [] if a cycle exists.

graph BFS topological-sort

+45 pts 40m