输入：num = "1432219", k = 3
输出：[4,2,4,-1,4]（最后一个 3 绕一圈找到 4）
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Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00590-0
Torque is the measure of a twisting or rotating force that can move something, like a wheel, around an axis.
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