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）。
tool is not a guarantee of better ranking
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As part of the shake-up, Tesco will create 250 new roles within existing teams at the Hertfordshire site, but did not specify which roles are being cut.
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if (n <= 1) return n;