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Real Exams

For 2024

Meta

  • Simple simulation
  • Mathematical Coding with Text Splits + Variable Length Suffix
  • Mathematical Coding with finding triplets
  • Mathematically splitting arrays

Belvedere Trading (SWE)

  • Determining the Stock Performance Score from a Continuous Stream of Trades.
  • Creating a Buy-Sell Ladder from a Continuous Stream of Trades.
  • Determining to Buy or Pass a Stock Bundle, given the market prices.

IXL

  • Find the Largest Common Divisor with Minimum Increments
  • Anagram Difference
  • Mathematic Programming
  • Find the longest consecutive elements after element deletions

IBM

  • Minimum number of machines required to finish the task, given start times and end times (Sort by start time, then use end time min heap)
  • Minimize i=1len(arr)1(arriarri1)2\sum_{i=1}^{\texttt{len}(\texttt{arr})-1} (\texttt{arr}_i - \texttt{arr}_{i-1})^2 (Find the max gap and then insert the avg in between)

Belvedere Trading (Analyst)

  • Sliding window (but both in traded stock count and trade history count) Stock price average finder
  • Linear Regression (Scikit)

Goldman Sachs

  • Sliding Window
  • Given a sequence of moving commands, is there a loop?

Optiver

  • Retain NN logs. recordLog(self, logId, timestamp), getLogs (self), getLogCount (self) Simulations, sliding window
  • Calculate stock price, given dividend payout on specific dates. Dividend payouts are editable. Simulations

MathWorks

  • The maximum minimum element after kk decrements. Optimized Simulations
  • Construct a graph and traverse it to find the MaxBeauty\text{MaxBeauty}, where Beauty\text{Beauty} for node kk is i=0Ndistance(i,k)×value(k)\sum_{i=0}^{N} \text{distance}(i, k) \times \text{value}(k)

Citadel

  • Find max increasing subarray, but in two arrays
  • Chess Move BFS

Ramp

  • Let's make a storage ownership system
  • Count NN largest files
  • Make it support many users (each has its storage limit), including root
    • Merge them
  • Cloud Backup & Restore

For 2023

PayPal

PathAI

Grammarly

Duolingo

  • 1 multiple map problem (simple data analysis & processing)
  • 1 path reduction problem (didn't have enough time)

LinkedIn

Akuna Capital — "Front Runner"

DRW

Akuna Capital Python

Akuna Capital C++

  • 10 multiple choice questions
    • required a deep understanding of C++ recent specs
  • 1 Greedy Algorithm palindrome substring search
  • 1 adjacency list construction and tree search.
    • Time limit was stringent, and I wasn't able to finish it
  • 1 Optimized Simulations using bitwise operations
    • Time limit was stringent, and I wasn't able to finish it

Valkyrie Trading

CodeSignal (HRT, Databricks

IMC

Garda Capital Partners

BlackRock

  • 1 stack
  • 1 BFS

For 2022

Facebook

Coinbase

Goldman Sachs

Sezzle

Twitch

Bloomberg