Collections.OrderedDict() in Python | HackerRank Solution

Hello coders, today we are going to solve Collections.OrderedDict() HackerRank Solution in Python.

Objective

Collections.OrderedDict()

An OrderedDict is a dictionary that remembers the order of the keys that were inserted first. If a new entry overwrites an existing entry, the original insertion position is left unchanged.

Example
_Code

>>> from collections import OrderedDict
>>> 
>>> ordinary_dictionary = {}
>>> ordinary_dictionary['a'] = 1
>>> ordinary_dictionary['b'] = 2
>>> ordinary_dictionary['c'] = 3
>>> ordinary_dictionary['d'] = 4
>>> ordinary_dictionary['e'] = 5
>>> 
>>> print ordinary_dictionary
{'a': 1, 'c': 3, 'b': 2, 'e': 5, 'd': 4}
>>> 
>>> ordered_dictionary = OrderedDict()
>>> ordered_dictionary['a'] = 1
>>> ordered_dictionary['b'] = 2
>>> ordered_dictionary['c'] = 3
>>> ordered_dictionary['d'] = 4
>>> ordered_dictionary['e'] = 5
>>> 
>>> print ordered_dictionary
OrderedDict([('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5)])

Task

You are the manager of a supermarket.
You have a list of N items together with their prices that consumers bought on a particular day.
Your task is to print each item_name and net_price in order of its first occurrence.
_{item_name = Name of the item.
net_price = Quantity of the item sold multiplied by the price of each item.}

Input Format

The first line contains the number of items, N.
The next N lines contains the item’s name and price, separated by a space.

Constraints

• 0 < N <= 100

Output Format

Print the item_name and net_price in order of its first occurrence.

Sample Input

9
BANANA FRIES 12
POTATO CHIPS 30
APPLE JUICE 10
CANDY 5
APPLE JUICE 10
CANDY 5
CANDY 5
CANDY 5
POTATO CHIPS 30

Sample Output

BANANA FRIES 12
POTATO CHIPS 60
APPLE JUICE 20
CANDY 20

Explanation

BANANA FRIES: Quantity bought: 1, Price: 12
Net Price: 12
POTATO CHIPS: Quantity bought: 2, Price: 30
Net Price: 60
APPLE JUICE: Quantity bought: 2, Price: 10
Net Price: 20
CANDY: Quantity bought: 4, Price: 5
Net Price: 20

Solution – Collections.OrderedDict() in Python

# Enter your code here. Read input from STDIN. Print output to STDOUT
from collections import OrderedDict

order = OrderedDict()
for _ in range(int(input())):
    item, space, price = input().rpartition(' ')
    order[item] = order.get(item, 0) + int(price)
for item, price in order.items():
    print(item, price)

Disclaimer: The above Problem (Collections.OrderedDict()) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.