Visa's recent written tests (OA) are being distributed widely! Many students only discovered after receiving invitations that Visa uses the CodeSignal platform, which has a massive question bank (approximately 2800+ questions), and the exam randomly selects 4 questions.
This means the traditional strategy of "practicing a few high-frequency questions before the exam" has become ineffective.
To help everyone understand the difficulty level, our oavoservice team has compiled 8 actual questions that appear frequently in recent Visa OAs. If you find these questions challenging or lack confidence in solving them within the time limit, please read to the end!
🔥 Visa Latest OA Question Selection
The leaked questions cover string processing, array optimization, matrix logic, simulation, and classic stack/queue problems.
1. Text Consistency Analysis (String Parsing)
Problem: Given a text string, count how many words have the same first and last letters (case-insensitive).
Difficulty: Easy
Example:
text = "Level dEmaND noNe"
Output = 2 (Level, noNe)
2. Recipe Ingredient Combination (Prefix String Matching)
Problem: Determine if each recipe in the recipes array can be formed by concatenating elements from the ingredients array in order from the beginning (prefix concatenation).
Difficulty: Medium
Example:
ingredients = ["flour", "sugar", "eggs"]
recipes = ["floursugar", "random"]
Output = [true, false]
3. "Nearly Regular Cross" in Matrix (Matrix Logic)
Problem: In a rectangular integer matrix, find "nearly regular" crosses (Nearly Regular Cross). Defined as: in a cross formed by a certain row and column, all elements except the intersection point are equal.
Difficulty: Medium
Approach: Requires O(N²·M + M²·N) complexity for row-column scanning.
4. Stock Trading Robot Optimization (Sliding Window Optimization)
Problem: Given stock prices and robot operation sequence algo (0=buy, 1=sell). You can choose an interval of length k and force all algo values in that interval to 1 (sell). Find the maximum profit after modification.
Difficulty: Hard
Key Point: This is a typical sliding window problem requiring dynamic calculation of profit changes as the window slides.
5. Social Media Message Filtering (Basic Filtering)
Problem: Count how many messages satisfy two conditions: odd length and contain at least one vowel.
Difficulty: Easy
Example:
messages = ["I", "love", "CSS"]
Output = 2 ("I", "love")
6. Sculpture Exhibition Highlights (Simulation / Priority Queue)
Problem: Define "Highlight" as a sculpture taller than both left and right neighbors. Each round, find the smallest among all Highlights, remove it and add to result array, continue until no Highlights remain.
Difficulty: Medium-Hard
Note: Data size allows O(N²), this problem tests complex simulation logic.
7. Molecular Reactor Scheduling (Queue Simulation with Capacity)
Problem: Lab reactor processes one sample in 5 minutes. New samples enter cooling room to wait. If cooling room (excluding currently processing) has more than 10 samples backlogged, new samples are rejected. Find total time to process all accepted samples.
Difficulty: Hard
Trap: Requires precise simulation of timeline and queue capacity, handling concurrent "arrival time" and "completion time" situations.
8. Maximum Square in City Skyline (Monotonic Stack / Geometry)
Problem: Given an array cityLine representing skyscraper heights (each width=1), find the area of the largest square that can fit within this skyline.
Difficulty: Hard
Analysis: This is a variant of the classic "largest rectangle in histogram" problem, with the constraint that the shape must be a square.
💡 Why Is It Hard to Get Full Marks on Visa OA?
Massive Question Bank: CodeSignal has 2800+ questions with extreme randomness, making targeted practice nearly impossible.
Complex Problem Types: Problems like Q4, Q7, Q8 involve sliding windows, complex queue simulation, and monotonic stack logic with numerous corner cases.
Time Pressure: Completing 4 questions in 70-90 minutes - any hesitation can prevent completion.
Not getting full marks likely means missing the interview opportunity.
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Facing random question banks and high-difficulty algorithm problems, oavoservice is your strongest support.
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