Question 6

Implement a Python decorator called timer that takes a single argument, which is the function to be timed. The decorator should push the execution time (in milliseconds) of the function after it completes to a list called execution_time which is already declared in the global scope. The function should return the same value it would return if it were not timed.

Example

function_name = "delay_max", args = [3,4,1], time_delay = 150

Decorate the function delay_max with timer, and call the decorated function with arguments 3, 4 and 1 with delay = 150.

decorated_func = timer(delay_max)
print(decorated_func(3, 4, 1, delay=150))

The above code should output 4, which is the return value of the function call delay_max(3, 4, 1, delay=150). The function delay_max takes 150 ms to complete, so, the decorator should push a value close to 150 to the list execution_time.

Function Description

Complete the function timer in the editor below. The function is a decorator with the below properties.

timer has the following parameter:

• func: A function

Constraints

• 1 ≤ n ≤ 20
• 1 ≤ args[i] ≤ 100
• function_name() ∈ {“delay_max”, “delay_min”, “delay_sum”}
• 50 ≤ time_delay ≤ 400
• time_delay is a multiple of 50

Input Format for Custom Testing

Sample Case 0

Sample Input for Custom Testing

delay_max 3 2 1 100
delay_sum 2 3 5 200
delay_min 4 5 1 300

Sample Output

3
10
1
[100, 200, 300]

Explanation

Here, there are 3 function calls

function_name = "delay_max", args = [3, 2, 1], time_delay = 100

decorate the function delay_max with timer, and call the decorated function with arguments 3, 2 and 1 with delay = 100. It should return 3. The decorator should push a value close to 100 to the list execution_time.

function_name = "delay_sum", args = [2, 3, 5], time_delay = 200

decorate the function delay_sum with timer, and call the decorated function with arguments 2, 3 and 5 with delay = 200. It should return 10. The decorator should push a value close to 200 to the list execution_time.

function_name = "delay_min", args = [4, 5, 1], time_delay = 300

decorate the function delay_min with timer, and call the decorated function with arguments 4, 5 and 1 with delay = 300. It should return 1. The decorator should push a value close to 300 to the list execution_time.

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Question 7

Use the HTTP GET method to retrieve information from a database of weather records. Query:

https://jsonmock.hackerrank.com/api/weather/search?name={keyword}

to search all the records where name has a keyword anywhere in its string value. The query result is paginated and can be further accessed by appending to the query string &page=num where num is the page number.

The query response from the API is a JSON with the following five fields:

Response Fields

• page: the current page
• per_page: the maximum number of results per page
• total: the total number of records in the search result
• total_pages: the total number of pages to query to get all the results
• data: an array of JSON objects that contain weather records

The data field in the response contains a list of weather records with the following schema:

Weather Record Fields

• name: the name of the city
• weather: temperature recorded
• status: an array of wind speed and humidity records

Filter records to include a given keyword in the name parameter. Return an array such that each element is a string of comma-separated values: city_name, temperature, wind, humidity.

For example:

{
  "name": "Adelaide",
  "weather": "15 degree",
  "status": {
    "wind": "6kmph",
    "humidity": "61%"
  }
}

The JSON record is stored as:

Adelaide,15 degree,6kmph,61%

Return the list sorted by city name.

Function Description

Complete the function weatherStation(keyword) in the editor below.

weatherStation has the following parameters:

• string keyword: the string to search

Returns

• string[]: the weather data for each city

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Question 8

Implement the SumTable data structure in Python. Its purpose is to manage tabular data of integers according to the following requirements:

• It is constructed as table = SumTable(arr) where arr is a list of n integer lists, each of length m. This constructs a SumTable with n rows and m columns where cell(i, j) initially contains the value of arr[i][j].
• It supports the get operator such that the expression table[i][j][2] returns the sum of values of all cells (i', j') such that 0 ≤ i' ≤ i and 0 ≤ j' ≤ j.
• It supports the assignment operator such that the statement table[i][j] = k assigns the value k to the cell (i, j).

Implement any additional methods as necessary.

The implementation will be tested by a code stub using several input files. Each input file contains the data to initialize the table followed by the description of the operations to be performed. First, a table instance of the SumTable class is constructed using the initialization data. Then, the operations are performed. There are two types of operations: get and set.

• get i j calls table[i][j][2] and appends the value of that expression to the results list.
• set i j k executes the assignment table[i][j] = k.

Values returned by the get operation are appended to the results list which is printed by the provided code stub.

Constraints

• 1 ≤ n, m ≤ 500
• 1 ≤ number of operations in one test file ≤ 10^5
• -100 ≤ arr[i][j], k ≤ 100
• There are at most 50 assignment operations in one test file
• 0 ≤ i < n
• 0 ≤ j < m

Sample Case 0

Sample Input

2
3
5
STOIN
2 rows
3 columns
arr = 2 x 3
arr = [[1, 2, 3], [4, 5, 6]]
5 number of queries q = 5

get 1 2
set 0 0 10
get 1 2
set 0 1 0
get 1 2

Sample Output

16
24
24

Explanation

The table has 2 rows and 3 columns and its values are initialized according to the given input array. There are 5 operations to be performed.

The first operation asks what is the sum of cells (i, j) in the table for 0 ≤ i ≤ 1 and 0 ≤ j ≤ 2. There are 6 such cells: (0,0), (0,1), (0,2), (1,0), (1,1), (1,2). The sum of their values is 1 + 2 + 3 + 4 + 5 + 6 = 21.

The second operation sets the value of cell (0,0) to 10. The third operation again asks for the sum of the same cells as the first operation asked. This sum is now 10 + 2 + 3 + 4 + 5 + 6 = 30.

The fourth operation sets the value of cell (0,1) to 0. The fifth operation asks what is the sum of cells (i, j) in the table for 0 ≤ i ≤ 1 and 0 ≤ j ≤ 2. There are 6 such cells: (0,0), (0,1), (0,2), (1,0), (1,1), (1,2). The sum of their values is 10 + 0 + 3 + 4 + 5 + 6 = 28.

The values returned by all the get operations are printed to the standard output.

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