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Introduction To Python
Python is a widely-used, interpreted, object-oriented, and high-level programming language with dynamic semantics, used for general-purpose programming. It was created by Guido van Rossum, and first released on February 20, 1991.
Python is a computer programming language often used to build websites and software, automate tasks, and conduct data analysis. It is also used to create various machine learning algorithm, and helps in Artificial Intelligence. Python is a general purpose language, meaning it can be used to create a variety of different programs and isn’t specialized for any specific problems. This versatility, along with its beginner-friendliness, has made it one of the most-used programming languages today. A survey conducted by industry analyst firm RedMonk found that it was the most popular programming language among developers in 2020.
Link for the Problem – collections.Counter() in Python – Hacker Rank Solution
collections.Counter() in Python – Hacker Rank Solution
Problem:
collections.Counter()
A counter is a container that stores elements as dictionary keys, and their counts are stored as dictionary values.
Sample Code
>>> from collections import Counter
>>>
>>> myList = [1,1,2,3,4,5,3,2,3,4,2,1,2,3]
>>> print Counter(myList)
Counter({2: 4, 3: 4, 1: 3, 4: 2, 5: 1})
>>>
>>> print Counter(myList).items()
[(1, 3), (2, 4), (3, 4), (4, 2), (5, 1)]
>>>
>>> print Counter(myList).keys()
[1, 2, 3, 4, 5]
>>>
>>> print Counter(myList).values()
[3, 4, 4, 2, 1]
Task :
Raghu is a shoe shop owner. His shop has X number of shoes. He has a list containing the size of each shoe he has in his shop. There are N number of customers who are willing to pay xi amount of money only if they get the shoe of their desired size. Your task is to compute how much money Raghu earned.
Input Format :
The first line contains X, the number of shoes.
The second line contains the space separated list of all the shoe sizes in the shop.
The third line contains N, the number of customers.
The next N lines contain the space separated values of the shoe size desired by the customer and xi, the price of the shoe.
Constraints :
- 0 <= X <= 10^3
- 0 <= N <= 10^3
- 20 <= xi <= 100
- 2 <= shoe size <= 20
Output Format :
Print the amount of money earned by Raghu.
Sample Input :
10 2 3 4 5 6 8 7 6 5 18 6 6 55 6 45 6 55 4 40 18 60 10 50
Sample Output :
200
Explanation :
Customer 1: Purchased size 6 shoe for $55.
Customer 2: Purchased size 6 shoe for $45.
Customer 3: Size 6 no longer available, so no purchase.
Customer 4: Purchased size 4 shoe for $40.
Customer 5: Purchased size 18 shoe for $60.
Customer 6: Size 10 not available, so no purchase.Total money earned = 55+45+40+60 = $200
collections.Counter() in Python – Hacker Rank Solution
# Enter your code here. Read input from STDIN. Print output to STDOUT
from collections import Counter
num_shoes = int(input())
shoe_sizes = Counter(map(int, input().split()))
num_customers = int(input())
cost = 0
for _ in range(num_customers):
size, price = map(int, input().split())
if shoe_sizes[size]:
cost += price
shoe_sizes[size] -= 1
print(cost)
