Challenging:

For each password, count the number of times the letter "i" appears in each password. Add these up for all passwords on the list. What is the total you get?

Hint: you'll need the substitute function to solve this. As a hint, if you replace your letter with "" in the string, you will get a shorter string. If you take the difference in length between the original string and the shorter string, you will be on your way to the answer.

Question

Challenging:

For each password, count the number of times the letter "i" appears in each password. Add these up for all passwords on the list. What is the total you get?

Hint: you'll need the substitute function to solve this. As a hint, if you replace your letter with "" in the string, you will get a shorter string. If you take the difference in length between the original string and the shorter string, you will be on your way to the answer.

BlackTom AI · Accepted Answer

The task asks you to process a list of passwords and tally the total number of occurrences of the letter 'i' across all of them. To approach this, follow these steps:

1) Understand the counting method: for any given password, the number of times 'i' appears is equal to the difference between the password’s length and the length of the password after removing all 'i' characters. In other words, count = original_length - length_after_removing_i.

2) Apply the substitute idea: by replacing every 'i' with an empty string or removing 'i' characters, you obtain a shorter string. The difference in lengths gives you the count of 'i's in that password.

3) Do this for each password in the list: compute the individual count of 'i' for each password using the method above.

4) Sum the per-password counts: add all these individual counts together to get the final total. This is a straightforward aggregation step once you have each password’s count.

5) Practical notes and potential pitfalls:
- Be mindful of case sensitivity: if passwords may include uppercase 'I' as well, decide whether you should count those too. The prompt specifies the letter "i"; if you must count both cases, apply the rule consistently (e.g., convert to lowercase first or count both 'i' and 'I').
- Ensure you’re counting across the entire list, not just a single password. The final total depends on the sum across all entries.
- If you encounter an empty password, its contribution is zero, since its length is already zero.

6) Verification idea: as a quick check, you can compute the counts in a couple of sample passwords manually, then confirm that the substitution method yields the same numbers, before summing across the full list.

In the given data, the structured approach described above will yield a numeric total that represents the combined count of the letter 'i' across all passwords. The numbers you obtain in practice should align with the provided answer when the full list is evaluated.

BUSI_V 335 972 2025SS BUSI 335 Midterm 2 2025 S2

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