* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）
* @param {number[]} speed 每辆车的速度数组（英里/小时）
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From photo quality to the lever you pull to print photos, Leica’s Sofort 2 is a terrific camera that’s remarkably similar to the Instax Mini Evo. In all of my tests, the photos I took with both looked identical. The two hybrid cameras also print smartphone photos via Instax Mini film and offer 10 film and lens effects, along with a macro mode for those who want more creative control. The Sofort 2’s minimalistic look is stylish, too, even if it’s not as charming as the retro-inspired Evo.
消费券是真金白银的补贴，也是拉动需求的有效工具。不过，消费券能降低游客的旅游成本，却无法自动兑换成为游客的满意指数。要想把消费券带来的短期流量转化为长期留量，关键不只是券发得多少，还在于文旅的内功练得有多深。