This is (more or less) cribbed from the USC contest winner's solution.
Very fast and very compact solution. Nice usage of complex to calculate distance between points and recursion.
Finding Perfect Squares
Test for balanced parentheses
Prime factor digits
We love vectorized solutions. Problem 1 : remove the row average.
Given a 4x4 matrix, swap the two middle columns
GJam 2011 Africa Qualifier C: House, maximum area rectangle
Packing Santa's Sleigh: First Layer
Image Processing 01: Vignetting Correction
GJam 2014 China Rd A: Maze with a Left Hand Rule
Rubik's Cube: 30 Moves or Less : Contest Scoring (Time/Size/Moves)
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