// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
1) What is an NFT?NFT stands for non-fungible token, which is a cryptographic token on a blockchain with unique identification codes that distinguish it from other tokens. NFTs are unique and not interchangeable, which means no two NFTs are the same. NFTs can be a unique artwork, GIF, Images, videos, Audio album. in-game items, collectibles etc.
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