Just recently had it done. BlackRock OA, I feel it is really "for nothing", the difficulty of the questions is very friendly, basically it is the level of LeetCode easy ~ medium. It only took me 20 minutes to get through all the ACs, and then I happily turned in my paper. I would like to review the questions and ideas for BlackRock, so that I can give a reference to students who are preparing for BlackRock.
BlackRock OA Test Form
The overall form of BlackRock OA is quite conventional, and not much different from the familiar OA of big manufacturers:
- Platform: It's a common online Coding platform with a clear interface and few pitfalls.
- durationI was given about 1 hour to write it, but I wrote it in 20 minutes and turned it in.
- quantity of questions: 2 questions in total.
- difficultyThe basic is LeetCode easy to medium level, a little bit of brush the foundation of the students can easily handle.
BlackRock OA Sharing of real questions
Add Number Series II
Programming challenge description. Write a program that, given an integer N, sums all the whole numbers from 1 through N (both inclusive). Do not include in your sum any of the intermediate values (1 and N inclusive) that are divisible by 5 or 7.
Input. Your program should read lines from standard input. Each line contains a positive integer.
Output. For each line of input, print to standard output the sum of the integers from 1 through n, disregarding those divisible by 5 and 7. Print out each result on a Print out each result on a new line.
Test 1 Test
Input
10 Expected Output
33Test 2 Test Input
7 Expected Output
16Set Intersection
Programming challenge description. Find the intersection of two sorted lists of integers.
Input. Your program should read lines of text from standard input. Each line will contain two comma separated lists of integers in ascending order, one pair of The lists are separated by a semicolon.
Output. For each pair of input lists, print to standard output their sorted intersection in ascending order, comma separated, one intersection per line.
Test 1 Test Input
1,2,3,4;4,5,6 Expected Output
4Test 2 Test Input
7,8,9;8,9,10,11,12Expected Output
8,9BlackRock Online Interview Summary
On the whole, BlackRock's OA is very easy paced, completely different from some investment banks/financial firms' common super high-pressure math questions, and more inclined to the examination of basic coding skills. As long as you have done easy/medium questions on LeetCode, this OA can be considered as a "bonus".
Recommended for students preparing for BlackRock:
- Brushing up on the classic array and string question types will suffice.
- You don't have to stress about time allocation, and it's less difficult than most tech company OA.
- If the goal is to get a solid interview, there's basically no bar at this level.
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