摘要：给定一个只包括 '('，')'，'{'，'}'，'['，']' 的字符串，判断字符串是否有效。 有效字符串需满足： 左括号必须用相同类型的右括号闭合。左括号必须以正确的顺序闭合。注意空字符串可被认为是有效字符串。 class Solution: def isValid(self, s): if le 阅读全文

摘要：# 将罗马数字转换成整型# class Solution:# def romanToInt(self, s):# d = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}# num = 0# for i in rang 阅读全文

摘要：class Solution: def isPalindrome(self, x): if str(x).startswith('-'): return False else: a = str(x) b = a[::-1] if a == b: return True else: return Fa 阅读全文

摘要：题目描述： # In this kata, you will write a function that returns the positions and the values of the "peaks" (or local maxima) of a numeric array.## For e 阅读全文

摘要：题目描述： The maximum sum subarray problem consists in finding the maximum sum of a contiguous subsequence in an array or list of integers: maxSequence([- 阅读全文

摘要：题目描述： Write a function called that takes a string of parentheses, and determines if the order of the parentheses is valid. The function should return 阅读全文

摘要：题目描述： # You are given an array strarr of strings and an integer k. Your task is to return the first longest string consisting of k consecutive strings 阅读全文

摘要：题目描述： # In this kata, you must create a digital root function.## A digital root is the recursive sum of all the digits in a number. Given n, take the 阅读全文

摘要：我的解答： import mathdef is_prime(n): if n > 1: if n == 2: return True if n % 2 == 0: return False for current in range(3, int(math.sqrt(n) + 1), 2): if n 阅读全文

摘要：题目描述： # Write a function that takes in a string of one or more words, and returns the same string, but with all five or more letter words reversed (Ju 阅读全文

摘要：题目描述： # You live in the city of Cartesia where all roads are laid out in a perfect grid.# You arrived ten minutes too early to an appointment, so you 阅读全文

摘要：题目描述： # Complete the method/function so that it converts dash/underscore delimited words into camel casing. The first word within the output should be 阅读全文

摘要：题目描述： # Number of people in the bus# There is a bus moving in the city, and it takes and drop some people in each bus stop.## You are provided with a 阅读全文

摘要：题目描述： # Write a function that will return the count of distinct# case-insensitive alphabetic characters and numeric digits t# hat occur more than once 阅读全文

摘要：题目描述： # Welcome. In this kata, you are asked to square every digit of a number.# For example, if we run 9119 through the function, 811181 will come ou 阅读全文

摘要：题目描述： # Write a function that takes an integer as input,# and returns the number of bits that are equal to one in the binary# representation of that n 阅读全文

摘要：题目描述：# Your goal in this kata is to implement a difference function, which subtracts one list from another and returns the result.## It should remove 阅读全文

摘要：题目描述： ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits. If the function is pas 阅读全文

摘要：题目描述：# The goal of this exercise is to convert a string to a new string where each character# in the new string is "(" if that character appears only 阅读全文