Python Coding
Challenges

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

Dicts & Sets medium

Group anagrams

Group words that are anagrams of each other.

dict sorting strings

+22 pts 20m