// 当前元素入栈：成为「左侧元素」的候选更大值（易错点4：别漏写这一步）
BYOB: complexity without payoff
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Гангстер одним ударом расправился с туристом в Таиланде и попал на видеоШведский гангстер одним ударом расправился с 57-летним туристом на Пхукете
Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.