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Sample Master-Level Programming Assignments and Solutions
Below are two master-level programming questions along with expertly crafted solutions.
Question 1: Implementing a Multi-Threaded Merge Sort in Java
Problem Statement: Implement a multi-threaded merge sort in Java that sorts an array of integers using concurrent threads.
Solution:
import java.util.concurrent.*;class MergeSortTask extends RecursiveAction { private int[] array; private int left, right; public MergeSortTask(int[] array, int left, int right) { this.array = array; this.left = left; this.right = right; } protected void compute() { if (left < right) { int mid = left + (right - left) / 2; MergeSortTask leftTask = new MergeSortTask(array, left, mid); MergeSortTask rightTask = new MergeSortTask(array, mid + 1, right); invokeAll(leftTask, rightTask); merge(left, mid, right); } } private void merge(int left, int mid, int right) { int[] temp = new int[right - left + 1]; int i = left, j = mid + 1, k = 0; while (i <= mid && j <= right) { temp[k++] = (array[i] <= array[j]) ? array[i++] : array[j++]; } while (i <= mid) temp[k++] = array[i++]; while (j <= right) temp[k++] = array[j++]; System.arraycopy(temp, 0, array, left, temp.length); }}public class MultiThreadMergeSort { public static void main(String[] args) { int[] array = {5, 2, 9, 1, 5, 6}; ForkJoinPool pool = new ForkJoinPool(); pool.invoke(new MergeSortTask(array, 0, array.length - 1)); for (int num : array) System.out.print(num + " "); }}Question 2: Implementing a Simple Blockchain in Python
Problem Statement: Design a basic blockchain structure with proof-of-work consensus using Python.
Solution:
import hashlibimport timeclass Block: def __init__(self, index, previous_hash, transactions, timestamp, nonce=0): self.index = index self.previous_hash = previous_hash self.transactions = transactions self.timestamp = timestamp self.nonce = nonce self.hash = self.calculate_hash() def calculate_hash(self): block_string = f"{self.index}{self.previous_hash}{self.transactions}{self.timestamp}{self.nonce}" return hashlib.sha256(block_string.encode()).hexdigest() def mine_block(self, difficulty): while self.hash[:difficulty] != '0' * difficulty: self.nonce += 1 self.hash = self.calculate_hash()class Blockchain: def __init__(self): self.chain = [self.create_genesis_block()] self.difficulty = 4 def create_genesis_block(self): return Block(0, "0", "Genesis Block", time.time()) def add_block(self, transactions): prev_block = self.chain[-1] new_block = Block(len(self.chain), prev_block.hash, transactions, time.time()) new_block.mine_block(self.difficulty) self.chain.append(new_block)bc = Blockchain()bc.add_block("Alice pays Bob 10 BTC")print([b.hash for b in bc.chain])Why Choose Our Programming Assignment Services?
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