Овечкин продлил безголевую серию в составе Вашингтона09:40
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Afghanistan's Taliban government has military equipment left behind by the former Afghan and foreign forces. And despite sanctions, reports suggest it has been able to purchase some military equipment through the black market.
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」