Programming assignment - Week 3 

Solutions

Note: There could be optimised ways to solve the problem, but the goal here is to solve it effectively. The most intuitive solution has been provided for clarity.

Programming assignment - 1

Create a Python program that finds the second largest number in a list of positive integers(includes zero). The program should prompt the user to input a list of numbers, then compute and print the second largest number in that list.

Input Format:

The input consists of a single list of numbers, separated by spaces.

Hint: Use .split() function to convert input to list.

Output Format:

The output consists of the second largest number in the input list.

Example:

Input:

3 1 4 1 5 9 2 6 5 3 5

Output:

6

Code:

def find_second_largest(numbers):
    unique_numbers = list(set(numbers))
    unique_numbers.sort(reverse=True)
    if len(unique_numbers) < 2:
        return "There is no second largest number."
    return unique_numbers[1]

input_string = input()

numbers_list = list(map(int, input_string.split()))

second_largest = find_second_largest(numbers_list)
print(second_largest, end="")

Programming assignment - 2

Create a Python program that removes all duplicate positive integer numbers(includes zero) from a list and prints the unique numbers in the order they first appeared.

The program should prompt the user to input a list of numbers, then process the list to remove duplicates and print the resulting list of unique numbers.

Input Format:

The input consists of a single list of numbers, separated by spaces.

Output Format:

The output consists of the unique numbers, separated by spaces, from the input list, in the order they first appeared.

Example:

Input:

3 1 4 1 5 9 2 6 5 3 5

Output:

3 1 4 5 9 2 6

Code:

def remove_duplicates(numbers):
    seen = set()
    unique_numbers = []
    for number in numbers:
        if number not in seen:
            seen.add(number)
            unique_numbers.append(number)
    return unique_numbers

input_string = input()

numbers_list = list(map(int, input_string.split()))

unique_numbers = remove_duplicates(numbers_list)
print(" ".join(map(str, unique_numbers)), end="")

Programming assignment - 3

Create a Python program that takes a list of integers, reverses the list, adds the values at odd indices from both the original and reversed lists, and creates a new list with the result. The new list should be printed in the end.

Input Format:

The input consists of a single list of integers, separated by spaces.

Output Format:

The output consists of the new list of values, separated by spaces, obtained by adding values at odd indices from both the original and reversed lists.

Example:

Input:

1 2 3 4 5

Output:

1 6 3 6 5

Code:

def process_list(input_list):
    reversed_list = input_list[::-1]
    new_list = []
    for i in range(len(input_list)):
        if i % 2 == 1:
            new_value = input_list[i] + reversed_list[i]
            new_list.append(new_value)
        else:
            new_list.append(input_list[i])
    
    return new_list

input_str = input()

input_list = list(map(int, input_str.split()))

result = process_list(input_list)

print(" ".join(map(str, result)), end="")

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Week 4 assignment solution coming soon ☺......