# Collections.OrderedDict() in python | HackerRank Solution

## Problem

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)])
```

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 contain the item's name and price, separated by a space.

### Output Format

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

```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

### Program

 ```1 2 3 4 5 6 7 8 9``` ```# import OrderedDict from collections from collections import* d = OrderedDict() for _ in range(int(input())): item, space, quantity = input().rpartition(' ') d[item] = d.get(item, 0) + int(quantity) for item, quantity in d.items(): print(item, quantity) ```
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