描述：设计 StockSpanner 类。每次调用 next(price) 时，返回当日价格的「跨度」：从今天往回数，价格 ≤ 今日价格的最大连续天数（含今天）。
These aren't niche tools used by tech enthusiasts. They're mainstream applications that everyday people now use for research, planning, learning, and decision-making. When someone searches for "best productivity apps for small teams," they're increasingly likely to ask an AI rather than Google. When a business owner needs to understand a technical topic, they're prompting Claude instead of reading blog posts. When students research topics for papers, they're querying Perplexity instead of clicking through search results.
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商务部公布调整对加拿大反歧视措施
stack.pop(); // 弹出无效候选值