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Python Logic to Find All Unique Pairs in an Array

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 Here's the Python logic for finding all unique pairs in an array that sum up to a target value. Python Unique Pair Problem Write a Python function that finds all unique pairs in an array whose sum equals a target value. Avoid duplicates in the result. For example: Input: arr = [2, 4, 3, 5, 7, 8, 9] , target = 9 Output: [(2, 7), (4, 5)] Hints Use a set for tracking seen numbers. Check for complements efficiently. Example def find_unique_pairs(arr, target):     """     Finds all unique pairs in the array that sum up to the target value.     Parameters:     arr (list): The input array of integers.     target (int): The target sum value.     Returns:     list: A list of unique pairs that sum to the target value.     """     seen = set()     pairs = set()     for num in arr:         complement = target - num         if complement in seen:...
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10 Blockchain Smart Contract Interview Questions

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10 Blockchain Smart Contract Interview Questions

Here are the top ten interview questions on Blockchain smart contracts. Here you will know about smart-contract, what language and IDE you need to develop. Useful for interviews as well.

1. What is a Smart Contract?


A smart contract is an executable code on the blockchain intended to digitally facilitate, verify, validate, and enforce the rules and regulations of an application. Smart contracts allow the performance of credible transactions without third parties. These transactions are trackable and irreversible.


2. Where the smart Contract code resides?


The smart contract is deployed in a sandbox environment and identified by a 160-bit account address like any other participants on the blockchain network. It executes on the virtual machine (VM) on the blockchain node and is identified by an account number.


3. Smart Contract is it API?


Yes, it is like a class. It has methods. These are useful to process transactions in the Blockchain framework.


4. What are the six functions of Smart-contract?


  • It represents a business logic layer for the verification and validation of application-specific conditions.
  • It allows for the specification of rules for operations on the blockchain.
  • It facilitates the implementation of policies for the transfer of assets in a decentralized network.
  • It embeds functions that can be invoked by messages or function calls from participant accounts or other smart contract accounts. These messages and their input parameters, along with additional metadata such as the sender's address and timestamp, result in transactions recorded in the distributed ledger of the blockchain.
  • It acts as the software-based intermediator for decentralized blockchain-based applications.
  • It adds programmability and intelligence to the blockchain through the specification of the parameters of its functions.

5. What are the three key elements of a Smart Contract?

  1. Data
  2. Functions that operate on the data
  3. Rules for operations

6. How does it looks like a Smart Contract?


  • Name of the class
  • Data definitions
  • Function definitions

7. What is the name of the Programming language you use?


Solidity is an object-oriented, high-level language for implementing smart contracts, influenced by C++, Python, and JavaScript. Solidity is statically typed and supports inheritance, libraries, and user-defined types; it also provides many useful features for developing blockchain applications.


8. What is the name of IDE?


Open the Remix web IDE in your browser.


9. Who can access the Smart contract code?


When a smart contract code is deployed on a blockchain, it is accessible to anybody who has a defined identity on that blockchain.


10. Best example of a Blockchain smart contract?

Airline System.

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