据知情人士透露，美国五角大楼意外击落了一架海关与边境保护局的无人机，位置在在德克萨斯州与墨西哥的边境，使用的是高能激光器。几周前另一起事件曾导致混乱，并暴露了美国多个机构之间的沟通失误。
const stack = []; // 单调递增栈：栈底→栈顶数字递增，保证高位尽可能小
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def save(self, item: Item) - None: