Are you looking for thrilling and unpredictable racing? No we're not talking about F1, unless you like regular pit stops, safety cars, and the same driver winning almost every week. We're talking about a form of two-wheel racing where anything could happen.
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// 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