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」
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She was told she would have to have her gallbladder removed, but before she could have the operation, her gallstones caused pancreatitis – an inflammatory disease that can be fatal.
Фото: Полина Дерр