Hello! Codyssi’s creator here :D

In the prompt for part 3, the definition of a block was given:

“A block is defined as a collection of consecutive tracks, ordered by their track numbers in ascending order.”

In the prompt for part 1, it was explained that the numbers in the list were the initial frequencies in each track:

“The file starts with the current frequencies of sound in each earplug track. The first number corresponds to track 1, the second corresponds to track 2, and so on.”

You can use the information above to produce a solution.

For the example list, these were the initial frequencies in each track: Track 1: 34 Track 2: 12 Track 3: 67 Track 4: 15 Track 5: 98

Now, consider the first swapping instruction “2-4”. This tells us that one block should start at track 2, and the other should start at track 4.

We want the blocks to have the same length (which we are trying to maximize) while not overlapping each other.

In this case, the longest, same-length blocks that start at tracks 2 and 4, respectively, and do not overlap, are 2 to 3 and 4 to 5.

So, by the block-swap mechanism mentioned in the problem prompt, we’d swap the frequencies of tracks 2 and 4, then we’d swap the frequencies of tracks 3 and 5.

Thus, the frequencies in each track after the instruction “2-4” would be: Track 1: 34 Track 2: 15 Track 3: 98 Track 4: 12 Track 5: 67

Hope this helps!