Given a non-negative integer n, return the numbers from n down to 1, in decreasing order. The decrementing loopDecrementing LoopWalking an index from n down to 1, appending each value as it goes — the mirror image of counting up. version is the direct analogue of counting up, just running backward. The range-then-reverseRange, Then ReverseGenerating the easy ascending sequence first, then reversing it — rather than hand-writing a descending loop. version builds the sequence everyone's more used to generating (ascending), then flips it — still O(n) overall, just composed from two simpler, well-known operations instead of one custom loop.