Most people Gareth encountered while he was sleeping on the streets were kind, but he says some made critical comments and stole his possessions in the night.
Paul Glynn and Helen BushbyCulture reporters
。爱思助手下载最新版本对此有专业解读
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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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