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question:def isValid(s: str) -> bool: Determine if the input string containing only characters '(', ')', '{', '}', '[' and ']' is valid. An input string is valid if: 1. Open brackets are closed by the same type of brackets. 2. Open brackets are closed in the correct order. >>> isValid("()") == True >>> isValid("()[]{}") == True >>> isValid("(]") == False >>> isValid("([)]") == False >>> isValid("{[]}") == True >>> isValid("") == True >>> isValid("{") == False >>> isValid("}") == False >>> isValid("([{}])") == True >>> isValid("((()))") == True >>> isValid("(") == False >>> isValid(")") == False >>> isValid("({}[()])") == True >>> isValid("[{]}") == False >>> isValid("{[()]}") == True >>> isValid("{[()]}}") == False >>> isValid("(({[]}))") == True

answer:def isValid(s: str) -> bool: Determine if the input string containing only characters '(', ')', '{', '}', '[' and ']' is valid. An input string is valid if: 1. Open brackets are closed by the same type of brackets. 2. Open brackets are closed in the correct order. :param s: input string :return: True if the input string is valid, False otherwise # Define a matching map for parentheses matching_parentheses = {')': '(', '}': '{', ']': '['} # Use a stack to track the opening parentheses stack = [] for char in s: if char in matching_parentheses: # Pop the last opening parenthesis from the stack if it's a closing parenthesis top_element = stack.pop() if stack else '#' if matching_parentheses[char] != top_element: return False else: # Push every opening parenthesis to the stack stack.append(char) # For the string to be valid, the stack should be empty return not stack

question:from typing import List def analyze_string_patterns(strings: List[str]) -> str: Analyzes a list of strings and returns the most common substring of length at least 2. In case of a tie, returns the lexicographically smallest substring. >>> analyze_string_patterns(["abcab", "bca", "cab"]) 'ab' >>> analyze_string_patterns(["aaaa", "aaab", "aabaa"]) 'aa' >>> analyze_string_patterns(["xyz", "wxyz", "zx"]) 'xz' >>> analyze_string_patterns([]) '' >>> analyze_string_patterns(["a", "b", "c"]) '' >>> analyze_string_patterns(["aabbcc", "bbccaa", "ccaabb"]) 'aa' >>> analyze_string_patterns(["abcd", "efgh"]) 'ab' >>> analyze_string_patterns(["abcabc", "cababc"]) 'ab' >>> analyze_string_patterns([ "abcdabcdabcd", "abcdabcdabcd", "abcdabcdabcd" ]) 'ab' >>> analyze_string_patterns(["a" * 100]) 'aa'

answer:from collections import defaultdict def analyze_string_patterns(strings): Analyzes a list of strings and returns the most common substring of length at least 2. In case of a tie, returns the lexicographically smallest substring. if not strings: return "" substring_count = defaultdict(int) for s in strings: length = len(s) for i in range(length): for j in range(i + 2, length + 1): substring = s[i:j] substring_count[substring] += 1 if not substring_count: return "" max_freq = max(substring_count.values()) most_common_substrings = [k for k, v in substring_count.items() if v == max_freq] most_common_substrings.sort() return most_common_substrings[0]

question:from typing import List from itertools import permutations def unique_permutations(s: str) -> List[str]: Write a function to find all unique permutations of a given string. The function should return these permutations as a list. Ensure the permutations do not contain any duplicate entries even if the input string has repeating characters. >>> unique_permutations("abc") ["abc", "acb", "bac", "bca", "cab", "cba"] >>> unique_permutations("aabc") ["aabc", "aacb", "abac", "abca", "acab", "acba", "baac", "baca", "bcaa", "caab", "caba", "cbaa"] >>> unique_permutations("a") ["a"] >>> unique_permutations("") [""] >>> unique_permutations("aaa") ["aaa"] # Your code here

answer:from itertools import permutations def unique_permutations(s): Returns a list of all unique permutations of the input string s. return sorted(set([''.join(p) for p in permutations(s)]))

question:import time class Transaction: def __init__(self, amount, transaction_type): Initialize a Transaction with a specified amount, type, and timestamp. self.amount = amount self.transaction_type = transaction_type self.timestamp = time.time() class Account: def __init__(self, username, password): Initialize an Account with a username, password, balance, and list of transactions. self.username = username self.password = password self.balance = 0 self.transactions = [] def deposit(self, amount): Deposit a specified amount into the account and log the transaction. Args: amount (float): The amount to deposit. Returns: bool: True if the deposit is successful, False otherwise. def withdraw(self, amount): Withdraw a specified amount from the account if enough balance is available. Args: amount (float): The amount to withdraw. Returns: bool: True if the withdrawal is successful, False otherwise. def transfer(self, amount, target_account): Transfer a specified amount to another account if enough balance is available. Args: amount (float): The amount to transfer. target_account (Account): The target account to transfer the money to. Returns: bool: True if the transfer is successful, False otherwise. def get_balance(self): Return the current account balance. Returns: float: The current balance of the account. def apply_interest(self): Apply 1% monthly interest to the account balance and log the transaction. class Bank: def __init__(self): Initialize the Bank with a dictionary of accounts. self.accounts = {} def create_account(self, username, password): Create a new account with given username and password. Args: username (str): The username for the new account. password (str): The password for the new account. Returns: bool: True if the account creation is successful, False if username is already taken. def get_account(self, username, password): Retrieve an account with the given username and password. Args: username (str): The username of the account. password (str): The password of the account. Returns: Account: The account object if credentials are correct, None otherwise. def calculate_interest_for_all_accounts(self): Apply monthly interest to all accounts in the bank. import pytest def test_create_account(): bank = Bank() assert bank.create_account("user1", "password") == True assert bank.create_account("user1", "password") == False # Duplicate user def test_deposit(): bank = Bank() bank.create_account("user1", "password") account = bank.get_account("user1", "password") assert account.deposit(1000) == True assert account.get_balance() == 1000 def test_withdraw(): bank = Bank() bank.create_account("user1", "password") account = bank.get_account("user1", "password") account.deposit(1000) assert account.withdraw(500) == True assert account.get_balance() == 500 assert account.withdraw(600) == False # Insufficient funds def test_transfer(): bank = Bank() bank.create_account("user1", "password") bank.create_account("user2", "password") account1 = bank.get_account("user1", "password") account2 = bank.get_account("user2", "password") account1.deposit(500) assert account1.transfer(200, account2) == True assert account1.get_balance() == 300 assert account2.get_balance() == 200 assert account1.transfer(500, account2) == False # Insufficient funds def test_interest(): bank = Bank() bank.create_account("user1", "password") account = bank.get_account("user1", "password") account.deposit(1000) bank.calculate_interest_for_all_accounts() assert abs(account.get_balance() - 1010) < 1e-9 # 1% interest if __name__ == "__main__": pytest.main()

answer:import time class Transaction: def __init__(self, amount, transaction_type): self.amount = amount self.transaction_type = transaction_type self.timestamp = time.time() class Account: def __init__(self, username, password): self.username = username self.password = password self.balance = 0 self.transactions = [] def deposit(self, amount): if amount > 0: self.balance += amount self.transactions.append(Transaction(amount, 'deposit')) return True return False def withdraw(self, amount): if amount <= self.balance: self.balance -= amount self.transactions.append(Transaction(amount, 'withdraw')) return True return False def transfer(self, amount, target_account): if self.withdraw(amount): target_account.deposit(amount) self.transactions.append(Transaction(amount, 'transfer')) return True return False def get_balance(self): return self.balance def apply_interest(self): interest = self.balance * 0.01 self.balance += interest self.transactions.append(Transaction(interest, 'interest')) class Bank: def __init__(self): self.accounts = {} def create_account(self, username, password): if username not in self.accounts: self.accounts[username] = Account(username, password) return True return False def get_account(self, username, password): account = self.accounts.get(username) if account and account.password == password: return account return None def calculate_interest_for_all_accounts(self): for account in self.accounts.values(): account.apply_interest()