The '-' in line 6 of y_correct for test case 4 should be a '~'.
You are absolutely correct. My apologies for this mistake. I should have tested this, and I thought I had for most testcases.
Swap the first and last columns
Find best domino orientation
Unique values without using UNIQUE function
Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration
Negation the hard way
Power supply: 230V to 115V
Create incremental spiral WITHOUT USING EVAL or FEVAL
Order of things - 2
Wayfinding 4 - Crossing, level 2
Order of things - 3
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