// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位
This is quick because it's operating on a very small, localized part of the map.。关于这个话题，51吃瓜提供了深入分析
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Jon Butterworth is professor of physics at University College London, and a member of the ATLAS Collaboration at Cern