// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）
10) How do we buy an NFTs?There are many places to buy digital assets, like opensea and their policies vary. On top shot, for instance, you sign up for a waitlist that can be thousands of people long. When a digital asset goes on sale, you are occasionally chosen to purchase it.
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We expect these to sell out very soon, so act fast to secure this low price.
Comparison between an unsorted and a luminance sorted candidate set, using Knoll’s algorithm on an 8-colour irregular palette. Left to right: unsorted, sorted.