作者： 负雪明烛 id： fuxuemingzhu 个人博客： http://fuxuemingzhu.cn/目录题目描述题目大意解题方法构造法递归相似题目参考资料日期 题目地址：https://leetcode.com/problems/beautiful-array/description/ 题目描述 For some fixed N, an array A is beautiful if it is a permutation of the integers 1, 2, …, N, such that: For every i < j, there is no k with i < k < j such that A[k] * 2 = A[i] + A[j]. Given N, r...
LeetCode in Python Remove Duplicates from Sorted Array II class Solution:def RemoveDuplicatesFromSortedArrayII(self, nums):if len(nums) <= 1:return len(nums)index = 2for i in range(2, len(nums)):if nums[i] != nums[index -2]:nums[index] = nums[i]index = index + 1print(nums)return indexs = Solution() nums = [1,1,1,3,4,4,5] res = s.RemoveDuplicatesFromSortedArrayII(nums) print(res)
numpy.ndarray.shap是返回一个数组维度的元组。 (2,)与(2,1)的区别如下： ?ndarray.shape：数组的维度。为一个表示数组在每个维度上大小的整数元组。例如二维数组中，表示数组的“行数”和“列数”。ndarray.shape返回一个元组，这个元组的长度就是维度的数目，即ndim属性。一般情况下： [1,2]的shape值(2,)，意思是一维数组，数组中有2个元素。 [[1],[2]]的shape值是(2,1)，意思是一个二维数组，每行有1个元素。 [[1,2]]的shape值...
题目：Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements. Your task is to find the smallest possible length of a (contiguous) subarray of nums, that has the same degree as nums. Example 1: Input: [1, 2, 2, 3, 1] Output: 2 Explanation: The inputarray has a degree of 2 because both elements 1 and 2 appear...
argsort()函数是将x中的元素从小到大排列，提取其对应的index(索引)当num>=0时，np.argsort()[num]就可以理解为y[num] 当num<0时，np.argsort()[num]就是把数组y的元素反向输出import numpy as np x = np.array([2,1,4,5,7,3,6] y = x.argsort() print (y[1], y[-1])
用python 语言实现一个动态数组 类似于python内置的list 首先 必须import ctypes用于生成指定大小的数组 constructor， 生成一个初始容量为10，里面一个元素都没有的数组#构造函数，创建了三个属性，分为用于指定初始容量，当前大小和当前数组 def __init__ (self):Create an empty array.self._n = 0 #sizeself._capacity = 10self._A = self._make_array(self._capacity)实现__len__函数，此函数是用于 当你使用len()函数时，会...
数组的应用 应用1：洗牌 描述：洗牌后每个元素随机出现在每个位置，且概率相等 方法1：调用库函数import random def shuffle_system(cards):random.shuffle(cards) 方法2：def shuffle_correct(cards):for i in range(len(cards)):randomi = i+ random.randint(0,len(cards)-i-1)card[i],cards[randomi] = cards[randomi],card[i] #对方法二的解释： #首先在0 - n-1下标中产生一个随机下标，交换第一...
Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Note:Your returned answers (both index1 and index2) are not zero-based. You may assume that each input would have exactly one...
我试图更充分地使用SQLAlchemy,而不是仅仅在遇到麻烦的最初迹象时才转而使用纯SQL.在这种情况下,我在Postgres数据库(9.5)中有一个表,该表通过将单个项atom_id与组标识符group_id关联来将一组整数存储为一个组. 给定一个atom_id的列表,我希望能够找出那个atom_id集合属于哪个group_id(如果有的话).仅使用group_id和atom_id列即可解决此问题. 现在,我试图进行概括,以使“组”不仅由atom_id列表组成,而且还由其他上下文组成.在下面的示...
我有一张表可以有一个状态：statuses = ['unmoderated', 'nominee', 'finalist', 'winner'] status = db.Enum(*statuses, name='enum_nomination_status', metadata=db.metadata)class Nomination(db.Model):status = db.Column(status, default='unmoderated')我现在想要一个包含多个状态的列的表：class Judge(db.Model):statuses = db.Column(ARRAY(status, dimensions=1))但是上述方法导致我出现此错误：ProgrammingError: (ps...