Nice one-liner regexprep with skillful reading of the input string format. The processing and output string creation is an efficient marvel.
Test if a Number is a Palindrome without using any String Operations
Project Euler: Problem 3, Largest prime factor
Find Rotated Substring
GJam March 2016 IOW: Password Single
QWERTY Shift Encoder
LMI Twins : Fuzzy Image matching
Rubik's Cube : Solve Ten Face Move - Speed Scoring
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