思路：单调递减栈，找「上一个比当前价格大的元素索引」。正序遍历，弹出所有 ≤ 当前价格的索引；跨度 = 当前索引 - 栈顶索引（栈空则为 当前索引 + 1）。
Lego Pokémon sets are now available to buy. The Pikachu and Poké Ball is listed for $199.99, Eevee is $59.99, and the Venusaur, Charizard, and Blastoise set is $649.99. These sets went live on Feb. 27. At this early stage, you're not going to find discounts on these set. Instead, you should be seeking out free gifts that sweeten the deal.
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nascent stages, MasterCard's predecessor pops up in 1966 to compete with Bank of
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const sp = speed[i];