5.1 输入标准（统一请求模板）
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，这一点在爱思助手下载最新版本中也有详细论述
// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
If you are suffering distress or despair and need support, you could speak to a health professional, or an organisation that offers support. Details of help available in many countries can be found at Befrienders Worldwide. In the UK, a list of organisations that can help is available at bbc.co.uk/actionline. Readers in the US and Canada can call the 988 suicide helpline or visit its website.