问题：给定数组 nums，返回等长数组，res[i] 为 nums[i] 右侧第一个更大元素，没有则 -1。
2) What is Blockchain?A blockchain is a distributed digital ledger that allows for the secure storage of data. By recording any kind of information—such as bank account transactions, the ownership of Non-Fungible Tokens (NFTs), or Decentralized Finance (DeFi) smart contracts—in one place, and distributing it to many different computers, blockchains ensure that data can’t be manipulated without everyone in the system being aware.，更多细节参见搜狗输入法下载
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