length!! and not "not isempty"... good point!
Test for balanced parentheses
Volume of this donut
Longest run of consecutive numbers
Set the array elements whose value is 13 to 0
Back to basics - mean of corner elements of a matrix
Without the French accent please!
Return a list sorted by number of consecutive occurrences
Can you beat the lottery again (for hardcore coder) ?
Magic is simple (for beginners)
BLOCK x3 (Version 3)
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