This article mainly introduces how to find the position of an element in a list using Python, which is of great reference value and hopefully helpful to everyone. How to Find the Position of an Element in a List Problem Description Given a sequence containing n integers, determine the position...
输入:nums = [1,2,3,5,5,7] target = 5 输出:[3,4] 输入:nums = [1,5,8,9] target = 7 输出:[-1,-1] 解决思路:二分查找直到找到第一个目标值,再对目标值左右进行二分查找 Python代码: classSolution(object):defsearchRange(self, nums, target):""":type nums: List[int] :type target...
def shell_sort(a_list): sub_list_count = len(a_list) // 2 while sub_list_count > 0: for start_position in range(sub_list_count): gap_insert_sort(a_list, start_position, sub_list_count) print("After increaments of size", sub_list_count, "The list is", a_list) sub_list_co...
:type target: int :rtype: List[int]"""first=0 last= len(nums) - 1found=False results= [-1, -1]ifnums ==[]:returnresultsiftarget < nums[0]ortarget >nums[last]:returnresultswhilefirst <= lastandnotfound: mid= (first + last) // 2 #找到了,分别继续向前,向后查找,直到找到第一个...
Use thenumpy.where()Function to Find the Indices of All the Occurrences of an Element in Python TheNumPylibrary has thewhere()function, which is used to return the indices of an element in an array based on some condition. For this method, we have to pass the list as an array. The ...
Given a Python list, we have to find the index of an item in a list. Submitted by Nijakat Khan, on July 15, 2022 To find the index of the specific element from the list, we can use the following methods:1) Using index() MethodThe index() method is used to find the index ...
Python99 P101: Find the last element of a list 求列表中最后一个元素 求列表中最后一个元素。用单元测试描述为: Python内建的list是有序序列,其中每个元素都可以通过位置索引直接访问。且Python内建了函数len,用读取任意有序序列的长度。先用len读取list的长度,将长度减去一即为末尾元素的位置索引。 位置...
Python Code: # Define a function to find the kth largest element in a list using quickselect algorithmdefquickselect(lst,k,start=0,end=None):# If 'end' is not specified, set it to the last index of the listifendisNone:end=len(lst)-1# Base case: If the 'start' position is great...
Python List Index Finding With theforLoop Method To find the index of an element in the list in Python, we can also use theforloop method. The code is: consonants=["b","f","g","h","j","k"]check="j"position=-1foriinrange(len(consonants)):ifconsonants[i]==check:position=ibre...
Thecount()method is a built-in Python function that returns the number of occurrences of a specified element in a list. This method is particularly useful when you need to know how many times a specific element appears in a list.