Python list of even integers hackerrank solution
Lists in Python - Hacker Rank SolutionCodeWorld19 9 Apr, 2021 1 Lists in Python - Hacker Rank Solution ProblemTutorial :When we talk about storing multiple values in a container-like data structure, the first thing that comes to mind is a list.You can initialize a list as: arr = list()
# or simply
arr = []
or with a few elements as: arr = [1,2,3]
Elements can be accessed easily similar to most programming languages: print arr[0]
# result is 1
print arr[0] + arr[1] + arr[2]
# result is 6
Lists in Python are very versatile. You can add almost anything in a Python list. In Python, you can create a list of any objects: strings, integers, or even lists. You can even add multiple types in a single list! Let's look at some of the methods you can use on list. 1.) append(x) Adds a single element x to the end of a list. arr.append(9)
print arr
# prints [1, 2, 3, 9]
2.) extend(L) Merges another list L to the end. arr.extend([10,11])
print arr
# prints [1, 2, 3, 9, 10, 11]
3.) insert(i,x) Inserts element x at position i. arr.insert(3,7)
print arr
# prints [1, 2, 3, 7, 9, 10, 11]
4.) remove(x) Removes the first occurrence of element x. arr.remove(10)
arr
# prints [1, 2, 3, 7, 9, 11]
5.) pop() Removes the last element of a list. If an argument is passed, that index item is popped out. temp = arr.pop()
print temp
# prints 11
6.) index(x) Returns the first index of a value in the list. Throws an error if it's not found. temp = arr.index(3)
print temp
# prints 2
7.) count(x) Counts the number of occurrences of an element x. temp = arr.count(1)
print temp
# prints 1
8.) sort() Sorts the list. arr.sort()
print arr
# [1, 2, 3, 7, 9]
9.) reverse() Reverses the list. arr.reverse()
print arr
# [9, 7, 3, 2, 1]
Problem Statement : Consider a list (list = []). You can perform the following commands:
Input Format :The first line contains an integer, n, denoting the number of commands.Each line i of the n subsequent lines contains one of the commands described above. Constraints :The elements added to the list must be integers.Output Format :For each command of type print, print the list on a new line.Sample Input :12
insert 0 5
insert 1 10
insert 0 6
print
remove 6
append 9
append 1
sort
print
pop
reverse
print
Sample Output :[6, 5, 10]
[1, 5, 9, 10]
[9, 5, 1]
Solution :
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