示例：nums = [2,1,2,4,3] → res = [4,2,4,-1,-1]。
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.。关于这个话题，同城约会提供了深入分析
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"This is a new scientific field. It's hard to speculate because it's changing so quickly," Wing says.