Please! Can you explain more than that?
Aye! The first column is not "sorted according the second column" (only half an explanation). The block of numbers in each row is treated as a fixed unit, and each row is rearranged such that the values in the second column are sorted in ascending order.
Back to basics 1 - Saving
Back to basics 2 - Function Path
Find best placement for ordered dominoes (harder)
Multiply a column by a row
Getting the indices from a vector
function on a moving window
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