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LeetQuant · Original educational content. Not affiliated with any trading firm. Nothing here is investment advice.

Problems

118 curated questions across 15 topics, each with hints and a worked solution, including at 24 firms.

– of 118 solved

Easy –/53Medium –/52Hard –/13

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13 results

Probability & Combinatorics

2

Hard#2
Expected Flips Until HTH
Probability · Numerical · 12 min
Hard#68
Break the Longer Piece
Goldman Sachs
Probability · Numerical · 12 min

Statistics & Statistical Inference

1

Hard#91
From Correlation to Win Rate
Citadel
Statistics · Numerical · 10 min

Expected Value & Decision Theory

4

Hard#54
100-Sided Die, Rerolls Cost a Dollar
Jane Street
Expected Value · Numerical · 12 min
Hard#56
Add One or Invert
Jane Street
Expected Value · Numerical · 15 min
Hard#60
Seeing Every Face Twice
Citadel Securities
Expected Value · Numerical · 15 min
Hard#67
Tying Spaghetti into Loops
Hudson River Trading
Expected Value · Numerical · 10 min

Brain Teasers & Logic

1

Hard#16
Five Pirates Split the Gold
Brain Teasers · Numerical · 12 min

Market Making & Trading Games

1

Hard#20
Make a Market: Five Cards
Market Making · Market making · 15 min

Stochastic Processes & Markov Chains

1

Hard#86
Will the Amoebas Die Out?
Morgan Stanley
Stochastic Processes · Numerical · 10 min

Derivatives Pricing & Greeks

1

Hard#31
Implied Volatility by Bisection
Derivatives · Coding · 20 min

Algorithms & Data Structures

1

Hard#41
Streaming Median of Trade Sizes
Algorithms · Coding · 25 min

Numerical Methods & Monte Carlo

1

Hard#45
Monte Carlo European Call
Numerical Methods · Coding · 20 min