change the signs of the even index entries of the reversed vector

example 1 vec = [4 -1 -2 9] ans = [9 2 -1 -4]

example2 vec = [-4 -1 -2 -9] ans = [-9 2 -1 4]

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Last Solution submitted on Feb 17, 2026

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BuiHoangSon 贵林 灰 Hanyang

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