Answered Essay: This is algorithm and advanced data structure class.

This is algorithm and advanced data structure class.

and please use python or c++ to complete this assignment.

Your program should:

Your program file must be named: counting_inversions.{py,cpp,rs}.

Take a filename as a command line input (see this example for how to do command line input and read a file in C++ and Python3).

Read the data into a 1-dimensional std::vector (C++) or a list (Python).

Pass the data to your counting inversions function.

Finally, your program should print the number of inversions that it found.

If you want to test your program I would recommend that you take a look at this Python program for generating input files. Once your program is completed, one partner should submit it to Gradescope (you should get immediate feedback and you can submit as many times as you’d like without it affecting your grade). Note: the autograder will not be available until next Monday.

Example Input/Output

Here is an example input file:


The above example is taken from our slides (with a couple extra numbers). The first line denotes how many numbers are in the array (n = 8). The remaining numbers should be read into an array and you should count the number of inversions. I will only test your program on inputs with a size that is a power of 2.

Your program’s output should look like this:



For Python Programs

I am requiring you to include a shebang at the top of your file/script. If you are using Python3 your shebang will look like this:

#!/usr/bin/env python3

If you are using Python 2.7 you should use this:

#!/usr/bin/env python

These will make it easy for me to run your code regardless of which version of Python you choose to use. Remember, any comments that you add to your file should come below this shebang.

For C++ Programs

I will be compiling your programs using g++. The exact command is:

g++ -std=c++14 -Wall -o counting_inversions counting_inversions.cpp

Expert Answer



#!/usr/bin/env python3

#The function
def countInversions(arrList):
for i in range(0,len(arrList)):
for j in range(i+1,len(arrList)):
if arrList[i] > arrList[j]:

return count

#File Handling and output
fileName=input(“Enter the file name: “);

#opening the file
f = open(fileName)
#we dont need the first line of input, which indicates the
#number of lines in file

#iterating over each line in file
for num in iter(f):



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