Capital One Online Assessment | Real Questions Review: Logic + Programming Full Coverage

Recently helped a trainee brush up on a set of Capital One . The overall question type of the OA is still on the regular logic + programming combination. The time is not particularly tight, but the number of questions is rather miscellaneous, so it is easy to step on the pit in the details. On the surface of the timetable, it is not tight, but in fact, because the number of questions is mixed, it is easy to be slowed down by the details of reading, analyzing, writing code, and adjusting bugs. In particular, such questions as string processing, matrix operations, once the steps are missed, it is possible to give up.
So the biggest feeling I got from this OA is that it's not about "not being able to do it", it's about being able to write it correctly in one go and stepping on fewer potholes that determines whether or not you can pass the exam successfully.

Capital One Online Assessment Sharing of real questions

Question 1: Find the first day reaching target

You are given an array of non-negative integers, which can be used as a reference to the number of integers in the integer. visits, where visits[i] is the number of visitors on the i-th day.
Return the first index I Such that visits[0] + visits[1] + ... + visits[i] >= target. If the total sum never reaches target, return -1.

Example

• visits = [120, 350, 180, 400, 250], target = 900 → Output 3
• visits = [600, 700, 800], target = 600 → Output 0
• visits = [200, 300, 100], target = 1000 → Output -1

👉 Idea: traverse the array to do the prefix sum, the side of the cumulative judgment, encountered to meet the conditions of the first day directly return index.

Question 2: Sort words by vowel-consonant difference

You are given a string text consisting of unique lowercase English words separated by spaces.
For each word, count the number of vowels (a, e, i, o, u) and consonants, and calculate their absolute difference.
Return the words sorted in ascending order of this absolute difference. If the differences are the same, sort alphabetically.

Example

• text = "apollo moon base"
  • "apollo" → vowel 3, consonant 3 → difference 0
  • "moon" → vowel 2, consonant 2 → difference 0
  • "base" → vowel 2, consonant 2 → difference 0
    Sorted results:["apollo", "base", "moon"]

👉 Idea: Use set to store vowels and traverse the statistics. Sort by difference first, then by dictionary.

Question 3: Matrix transformation with commands

You are given a 2D list matrix and a list of commands commands. Each command can be one of the following.

• "swapRows r1 r2"
• "swapColumns c1 c2"
• "reverseRow r"
• "reverseColumn c"
• "rotate90Clockwise"

Apply the commands in order and return the final state of the matrix.

Example

matrix = [
  [10, 20, 30], [40, 50, 60], [
  [40, 50, 60], [70, 80, 90].
  [70, 80, 90]
]

commands = ["swapRows 0 1", "swapColumns 0 2", "reverseRow 2", "rotate90Clockwise" ]

result =
[
  [70, 40, 10], [80, 50, 20], "swapColumns 0 2", "reverseRow 2", "rotate90Clockwise"]
  [80, 50, 20], [90, 60, 30], [90, 60, 30], "rotate90Clockwise"]
  [90, 60, 30]
]

👉 Idea: Just simulate the operation. Be careful. rotate90Clockwise The realization of this can be done by transposing + flipping rows.

Question 4: String replacement operations

You are given a string s and a list of operations operations.
Each operation has the form "replace old new", meaning replace all occurrences of old with new.
Apply the operations in order and return the final string.

Example

s = "robot arm system online"
operations = ["replace robot drone", "replace online active", "replace arm hand"]

Execution process:

• robot → drone → "drone arm system online"
• online → active → "drone arm system active"
• arm → hand → "drone hand system active"

Final Results:"drone hand system active"

👉 Idea: use the string's replace Methods are handled sequentially.

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