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Quant Trader

· 21-day option

Speed, intuition, expected value and market sense — the mental-math and game-theory muscle for trading desks (Optiver, IMC, SIG, Jane Street).

Sign in to track your progress — each problem checks off as you solve it.

01Mental Math & Expected Value

22
Flips Until First Head
ProbabilityOptiverIMC Trading
Easy20
Roll Until All Six Faces
ProbabilityGoogleTwo Sigma
Medium24
Two Dice Sum to 7
ProbabilityOptiverIMC Trading
Easy30
Expected Max of Two Dice
ProbabilityOptiverIMC Trading
Medium6
Sum 1 to 100
Brain TeasersJane StreetGoldman Sachs
Easy2
Trailing Zeros in 100!
Brain TeasersGoldman SachsJ.P. Morgan
Easy9
Last Digit of 2^100
Brain TeasersGoldman SachsMorgan Stanley
Easy5
Clock Hands at 3:15
Brain TeasersMorgan StanleyBarclays
Easy

02Probability & Game Theory

18
Coin Toss — Two Heads
ProbabilityJane Street
Easy19
Monty Hall
ProbabilityGoldman SachsMorgan Stanley
Easy29
Two Children
ProbabilityGoldman SachsMorgan Stanley
Easy25
Bayes — Disease Test
ProbabilityGoldman SachsTwo Sigma
Medium21
Birthday Problem
ProbabilityGoldman SachsCitadel
Medium23
Drunk Passenger
ProbabilityJane StreetCitadel
Medium31
Russian Roulette — Spin?
ProbabilityJane StreetCitadel
Medium26
Broken Stick Triangle
ProbabilityJane StreetCitadel
Medium1
Screwy Pirates
Brain TeasersJane StreetOptiver
Hard

03Brain Teasers & Logic

3
Two Eggs, 100 Floors
Brain TeasersGoogleGoldman Sachs
Medium4
Horse Race — Top 3
Brain TeasersGoogleTwo Sigma
Medium7
100 Lockers
Brain TeasersGoogleTwo Sigma
Medium8
Poisoned Wine
Brain TeasersGoogleJane Street
Medium10
Mislabeled Jars
Brain TeasersJane StreetOptiver
Medium

04Options Intuition & Greeks

107
Delta of an ATM Call
Options & GreeksOptiverIMC Trading
Easy109
Gamma Near Expiry
Options & GreeksOptiverIMC Trading
Medium108
Delta of a Forward
Options & GreeksOptiverIMC Trading
Easy110
Most Negative Put Delta
Options & GreeksGoldman SachsOptiver
Easy111
Sign of Theta
Options & GreeksOptiverSIG / Susquehanna
Medium

05Fair Value & Pricing

90
Put-Call Parity
FinanceGoldman SachsMorgan Stanley
Easy94
Futures Fair Value
FinanceGoldman SachsOptiver
Easy92
Risk-Neutral Probability
FinanceGoldman SachsJ.P. Morgan
Medium

06Coding & Algorithms

64
Two SumLeetCode
Algorithms & NumericalGoogleDE Shaw
Easy72
Best Time to Buy and Sell StockLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium80
Best Time to Buy and Sell Stock IILeetCode
Algorithms & NumericalOptiverJane Street
Medium69
Maximum Subarray (Kadane)LeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium81
Gas StationLeetCode
Algorithms & NumericalJane StreetCitadel
Medium82
Jump GameLeetCode
Algorithms & NumericalGoogleDE Shaw
Medium83
Nim GameLeetCode
Algorithms & NumericalJane StreetSIG / Susquehanna
Easy84
Predict the WinnerLeetCode
Algorithms & NumericalJane StreetOptiver
Medium
Follow as a 21-day schedule

Interleaved, easy → hard, mixed daily

1
Day 1

Brain teasers · Probability

18
Coin Toss — Two Heads
ProbabilityJane Street
Easy2
Trailing Zeros in 100!
Brain TeasersGoldman SachsJ.P. Morgan
Easy
2
Day 2

Coding · Options

64
Two SumLeetCode
Algorithms & NumericalGoogleDE Shaw
Easy107
Delta of an ATM Call
Options & GreeksOptiverIMC Trading
Easy
3
Day 3

Brain teasers · Probability

19
Monty Hall
ProbabilityGoldman SachsMorgan Stanley
Easy5
Clock Hands at 3:15
Brain TeasersMorgan StanleyBarclays
Easy
4
Day 4

Coding · Finance

90
Put-Call Parity
FinanceGoldman SachsMorgan Stanley
Easy83
Nim GameLeetCode
Algorithms & NumericalJane StreetSIG / Susquehanna
Easy
5
Day 5

Brain teasers · Probability

22
Flips Until First Head
ProbabilityOptiverIMC Trading
Easy6
Sum 1 to 100
Brain TeasersJane StreetGoldman Sachs
Easy
6
Day 6

Options · Probability

24
Two Dice Sum to 7
ProbabilityOptiverIMC Trading
Easy108
Delta of a Forward
Options & GreeksOptiverIMC Trading
Easy
7
Day 7

Coding · Brain teasers

69
Maximum Subarray (Kadane)LeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium9
Last Digit of 2^100
Brain TeasersGoldman SachsMorgan Stanley
Easy
8
Day 8

Coding · Probability

29
Two Children
ProbabilityGoldman SachsMorgan Stanley
Easy72
Best Time to Buy and Sell StockLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium
9
Day 9

Brain teasers · Probability

3
Two Eggs, 100 Floors
Brain TeasersGoogleGoldman Sachs
Medium20
Roll Until All Six Faces
ProbabilityGoogleTwo Sigma
Medium
10
Day 10

Finance · Options

94
Futures Fair Value
FinanceGoldman SachsOptiver
Easy110
Most Negative Put Delta
Options & GreeksGoldman SachsOptiver
Easy
11
Day 11

Brain teasers · Probability

21
Birthday Problem
ProbabilityGoldman SachsCitadel
Medium4
Horse Race — Top 3
Brain TeasersGoogleTwo Sigma
Medium
12
Day 12

Coding · Probability

80
Best Time to Buy and Sell Stock IILeetCode
Algorithms & NumericalOptiverJane Street
Medium23
Drunk Passenger
ProbabilityJane StreetCitadel
Medium
13
Day 13

Coding · Brain teasers

7
100 Lockers
Brain TeasersGoogleTwo Sigma
Medium81
Gas StationLeetCode
Algorithms & NumericalJane StreetCitadel
Medium
14
Day 14

Options · Probability

109
Gamma Near Expiry
Options & GreeksOptiverIMC Trading
Medium25
Bayes — Disease Test
ProbabilityGoldman SachsTwo Sigma
Medium
15
Day 15

Brain teasers · Probability

8
Poisoned Wine
Brain TeasersGoogleJane Street
Medium26
Broken Stick Triangle
ProbabilityJane StreetCitadel
Medium
16
Day 16

Coding · Finance

82
Jump GameLeetCode
Algorithms & NumericalGoogleDE Shaw
Medium92
Risk-Neutral Probability
FinanceGoldman SachsJ.P. Morgan
Medium
17
Day 17

Brain teasers · Probability

10
Mislabeled Jars
Brain TeasersJane StreetOptiver
Medium30
Expected Max of Two Dice
ProbabilityOptiverIMC Trading
Medium
18
Day 18

Options

111
Sign of Theta
Options & GreeksOptiverSIG / Susquehanna
Medium
19
Day 19

Coding

84
Predict the WinnerLeetCode
Algorithms & NumericalJane StreetOptiver
Medium
20
Day 20

Brain teasers

1
Screwy Pirates
Brain TeasersJane StreetOptiver
Hard
21
Day 21

Probability

31
Russian Roulette — Spin?
ProbabilityJane StreetCitadel
Medium