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Complete · 30 Days

· 30-day option

An intense one-month pass through the whole bank — every topic and all coding, interleaved so each one keeps coming back instead of being crammed once, ramping gently from easy to hard. About five problems a day.

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

01Brain Teasers

2
Trailing Zeros in 100!
Brain TeasersGoldman SachsJ.P. Morgan
Easy5
Clock Hands at 3:15
Brain TeasersMorgan StanleyBarclays
Easy6
Sum 1 to 100
Brain TeasersJane StreetGoldman Sachs
Easy9
Last Digit of 2^100
Brain TeasersGoldman SachsMorgan Stanley
Easy13
Handshakes at a Party
Brain TeasersGoldman Sachs
Easy3
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
Medium11
Burning Ropes — 45 Minutes
Brain TeasersGoldman SachsMorgan Stanley
Medium14
Bridge Crossing
Brain TeasersGoogleJane Street
Medium15
Ants on a Triangle
Brain TeasersGoldman SachsOptiver
Medium16
Water Jugs
Brain TeasersGoogle
Medium17
Three Switches
Brain TeasersGoldman SachsMorgan Stanley
Medium1
Screwy Pirates
Brain TeasersJane StreetOptiver
Hard12
12 Balls, One Odd
Brain TeasersCitadelJane StreetTwo Sigma
Hard

02Probability

18
Coin Toss — Two Heads
ProbabilityJane Street
Easy19
Monty Hall
ProbabilityGoldman SachsMorgan Stanley
Easy22
Flips Until First Head
ProbabilityOptiverIMC Trading
Easy24
Two Dice Sum to 7
ProbabilityOptiverIMC Trading
Easy29
Two Children
ProbabilityGoldman SachsMorgan Stanley
Easy35
Expected Rolls for a Six
ProbabilityOptiverIMC Trading
Easy36
At Least One Six
ProbabilitySIG / SusquehannaOptiver
Easy20
Roll Until All Six Faces
ProbabilityGoogleTwo Sigma
Medium21
Birthday Problem
ProbabilityGoldman SachsCitadel
Medium23
Drunk Passenger
ProbabilityJane StreetCitadel
Medium25
Bayes — Disease Test
ProbabilityGoldman SachsTwo Sigma
Medium26
Broken Stick Triangle
ProbabilityJane StreetCitadel
Medium27
Top Two Aces
ProbabilitySIG / SusquehannaOptiver
Medium28
Hat Check
ProbabilityJane StreetDE Shaw
Medium30
Expected Max of Two Dice
ProbabilityOptiverIMC Trading
Medium31
Russian Roulette — Spin?
ProbabilityJane StreetCitadel
Medium32
Expected Min of Two Dice
ProbabilityOptiverSIG / Susquehanna
Medium33
Poisson — No Arrivals
ProbabilityTwo SigmaJump Trading
Medium34
Exponential Survival
ProbabilityDE ShawMorgan Stanley
Medium37
Expected Max of Two Uniforms
ProbabilityJane StreetCitadel
Medium

03Stochastic Processes

41
Variance of Brownian Motion
Stochastic ProcessesGoldman SachsMorgan Stanley
Easy38
Flips Until Two Heads in a Row
Stochastic ProcessesJane StreetCitadel
Medium39
Gambler’s Ruin
Stochastic ProcessesJane StreetSIG / Susquehanna
Medium42
Covariance of Brownian Motion
Stochastic ProcessesGoldman SachsTwo Sigma
Medium44
Random Walk Recurrence
Stochastic ProcessesTwo SigmaDE Shaw
Medium45
Quadratic Variation of BM
Stochastic ProcessesGoldman SachsTwo Sigma
Medium40
Expectation of GBM
Stochastic ProcessesGoldman SachsMorgan Stanley
Hard43
Expected Flips for HTH
Stochastic ProcessesJane StreetSIG / Susquehanna
Hard46
Random Walk — Expected Steps
Stochastic ProcessesJane StreetTwo Sigma
Hard47
Expected Running Max of BM
Stochastic ProcessesGoldman SachsDE Shaw
Hard

04Calculus & Linear Algebra

48
Definite Integral of x²
Calculus & Linear AlgebraGoldman Sachs
Easy49
Limit of sin(x)/x
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Easy54
Geometric Series
Calculus & Linear AlgebraGoldman Sachs
Easy55
Limit of (1+1/n)^n
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Easy57
L'Hôpital — (eˣ−1)/x
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Easy58
Derivative of ln(x)
Calculus & Linear AlgebraGoldman Sachs
Easy59
Sum of First 10 Squares
Calculus & Linear AlgebraJane StreetTwo Sigma
Easy60
Trace = Sum of Eigenvalues
Calculus & Linear AlgebraTwo SigmaGoldman Sachs
Easy61
Determinant = Product of Eigenvalues
Calculus & Linear AlgebraTwo SigmaDE Shaw
Easy63
Approximate cos(0.1)
Calculus & Linear AlgebraJane StreetOptiver
Easy50
Eigenvalues of a 2×2
Calculus & Linear AlgebraGoldman SachsCitadel
Medium51
Gaussian Integral
Calculus & Linear AlgebraGoldman SachsTwo Sigma
Medium52
Derivative of xˣ
Calculus & Linear AlgebraJane StreetCitadel
Medium56
Integral of x·e^(−x)
Calculus & Linear AlgebraGoldman SachsTwo Sigma
Medium62
Integrate x·eˣ
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Medium53
Maximize x^(1/x)
Calculus & Linear AlgebraJane StreetSIG / Susquehanna
Hard

05Algorithms & Numerical

64
Two SumLeetCode
Algorithms & NumericalGoogleDE Shaw
Easy73
Monte Carlo — Estimate π
Algorithms & NumericalGoldman SachsTwo Sigma
Easy74
Newton’s Method for √2
Algorithms & NumericalGoldman SachsJane Street
Easy83
Nim GameLeetCode
Algorithms & NumericalJane StreetSIG / Susquehanna
Easy65
Product of Array Except SelfLeetCode
Algorithms & NumericalTwo SigmaHRT
Medium67
Kth Largest ElementLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium69
Maximum Subarray (Kadane)LeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium70
Random Pick with WeightLeetCode
Algorithms & NumericalCitadelTwo Sigma
Medium71
Shuffle an Array (Fisher-Yates)LeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium72
Best Time to Buy and Sell StockLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium75
Rand10() from Rand7()LeetCode
Algorithms & NumericalJane StreetOptiver
Medium76
Coin Change (DP)LeetCode
Algorithms & NumericalGoogleDE Shaw
Medium78
Online Stock SpanLeetCode
Algorithms & NumericalCitadel SecuritiesHRT
Medium79
Time-Based Key-Value StoreLeetCode
Algorithms & NumericalTwo SigmaJump Trading
Medium80
Best Time to Buy and Sell Stock IILeetCode
Algorithms & NumericalOptiverJane Street
Medium81
Gas StationLeetCode
Algorithms & NumericalJane StreetCitadel
Medium82
Jump GameLeetCode
Algorithms & NumericalGoogleDE Shaw
Medium84
Predict the WinnerLeetCode
Algorithms & NumericalJane StreetOptiver
Medium85
LRU CacheLeetCode
Algorithms & NumericalTwo SigmaHRT
Medium86
Longest Increasing SubsequenceLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium88
Course ScheduleLeetCode
Algorithms & NumericalGoogleDE Shaw
Medium89
Number of IslandsLeetCode
Algorithms & NumericalGoogleTwo Sigma
Medium66
Trapping Rain WaterLeetCode
Algorithms & NumericalJane StreetCitadel Securities
Hard68
Sliding Window MaximumLeetCode
Algorithms & NumericalHRTJump Trading
Hard77
Median of Two Sorted ArraysLeetCode
Algorithms & NumericalGoogleTwo Sigma
Hard87
Find Median from Data StreamLeetCode
Algorithms & NumericalTwo SigmaCitadel
Hard

06Finance

90
Put-Call Parity
FinanceGoldman SachsMorgan Stanley
Easy93
Zero-Coupon Bond Price
FinanceGoldman SachsPIMCO
Easy94
Futures Fair Value
FinanceGoldman SachsOptiver
Easy95
Duration & Price Sensitivity
FinanceGoldman SachsJ.P. MorganPIMCO
Easy96
Perpetuity Value
FinanceGoldman SachsJ.P. Morgan
Easy97
Rule of 72
FinanceGoldman SachsMorgan Stanley
Easy100
Coupon Equals Yield
FinanceGoldman SachsPIMCO
Easy101
Current Yield
FinanceBarclaysMorgan Stanley
Easy104
Duration and a Rate Move
FinancePIMCOBlackRock
Easy106
Real Rate of Return
FinancePIMCOCitadel
Easy91
Black-Scholes ATM Call
FinanceGoldman SachsMorgan Stanley
Medium92
Risk-Neutral Probability
FinanceGoldman SachsJ.P. Morgan
Medium98
Gordon Growth Model
FinanceGoldman SachsMorgan Stanley
Medium99
Implied Forward Rate
FinanceJ.P. MorganBarclays
Medium102
Forward Price with a Dividend Yield
FinanceJ.P. MorganCitadel
Medium103
FX Forward by Interest Parity
FinanceGoldman SachsBarclays
Medium105
Present Value of an Annuity
FinanceMorgan StanleyJ.P. Morgan
Medium

07Options & Greeks

107
Delta of an ATM Call
Options & GreeksOptiverIMC Trading
Easy108
Delta of a Forward
Options & GreeksOptiverIMC Trading
Easy110
Most Negative Put Delta
Options & GreeksGoldman SachsOptiver
Easy112
Sign & Peak of Vega
Options & GreeksOptiverIMC Trading
Easy113
Delta Hedging
Options & GreeksOptiverCitadel Securities
Easy116
How Dear Can a Call Be?
Options & GreeksJane StreetAkuna Capital
Easy118
Find the Put from Parity
Options & GreeksGoldman SachsMorgan Stanley
Easy119
Delta of a Deep ITM Call
Options & GreeksIMC TradingOptiver
Easy121
Straddle Breakeven
Options & GreeksSIG / SusquehannaAkuna Capital
Easy122
Covered Call Max Profit
Options & GreeksMorgan StanleyIMC Trading
Easy109
Gamma Near Expiry
Options & GreeksOptiverIMC Trading
Medium111
Sign of Theta
Options & GreeksOptiverSIG / Susquehanna
Medium114
Early Exercise of a Call
Options & GreeksGoldman SachsMorgan Stanley
Medium115
Delta of an ATM Straddle
Options & GreeksOptiverIMC TradingSIG / Susquehanna
Medium117
Value of a Box Spread
Options & GreeksOptiverCitadel Securities
Medium120
Worst Case with a Protective Put
Options & GreeksBarclaysJ.P. Morgan
Medium

08Portfolio & Risk

123
Sharpe Ratio
Portfolio & RiskGoldman SachsAQR Capital
Easy132
Portfolio Beta
Portfolio & RiskGoldman SachsAQR Capital
Easy124
Two-Asset Portfolio Volatility
Portfolio & RiskGoldman SachsAQR Capital
Medium125
Value at Risk (Normal)
Portfolio & RiskGoldman SachsMorgan StanleyMillennium Management
Medium126
CVaR / Expected Shortfall
Portfolio & RiskAQR CapitalTwo Sigma
Medium127
Diversification & Sharpe
Portfolio & RiskAQR CapitalCitadel
Medium128
Maximum Drawdown
Portfolio & RiskCitadelTwo SigmaMan Group
Medium129
Kelly Criterion
Portfolio & RiskCitadelJane Street
Medium130
VaR Time Scaling
Portfolio & RiskGoldman SachsMorgan Stanley
Medium131
Minimum-Variance Weight
Portfolio & RiskAQR CapitalBlackRock
Medium133
Annualizing Sharpe
Portfolio & RiskTwo SigmaAQR Capital
Medium

09Statistics

135
Variance of Uniform(0,1)
StatisticsGoldman SachsCitadel
Easy136
OLS Slope
StatisticsTwo SigmaAQR Capital
Easy137
Variance of a Sum
StatisticsGoldman SachsMorgan Stanley
Easy138
Central Limit Theorem
StatisticsGoldman SachsMorgan Stanley
Easy139
MLE of a Coin
StatisticsTwo SigmaDE Shaw
Easy141
Range of Correlation
StatisticsGoldman SachsCitadel
Easy142
Variance of a Scaled Variable
StatisticsGoldman Sachs
Easy134
Correlation of X and X²
StatisticsTwo SigmaDE Shaw
Medium140
Covariance of a Linear Transform
StatisticsGoldman SachsAQR Capital
Medium143
Variance of the Sample Mean
StatisticsTwo SigmaDE Shaw
Medium
Follow as a 30-day schedule

Interleaved, easy → hard, mixed daily

1
Day 1

Coding · Brain teasers · Calculus

64
Two SumLeetCode
Algorithms & NumericalGoogleDE Shaw
Easy18
Coin Toss — Two Heads
ProbabilityJane Street
Easy2
Trailing Zeros in 100!
Brain TeasersGoldman SachsJ.P. Morgan
Easy90
Put-Call Parity
FinanceGoldman SachsMorgan Stanley
Easy48
Definite Integral of x²
Calculus & Linear AlgebraGoldman Sachs
Easy
2
Day 2

Coding · Options · Portfolio

107
Delta of an ATM Call
Options & GreeksOptiverIMC Trading
Easy123
Sharpe Ratio
Portfolio & RiskGoldman SachsAQR Capital
Easy135
Variance of Uniform(0,1)
StatisticsGoldman SachsCitadel
Easy41
Variance of Brownian Motion
Stochastic ProcessesGoldman SachsMorgan Stanley
Easy73
Monte Carlo — Estimate π
Algorithms & NumericalGoldman SachsTwo Sigma
Easy
3
Day 3

Brain teasers · Calculus · Finance

19
Monty Hall
ProbabilityGoldman SachsMorgan Stanley
Easy5
Clock Hands at 3:15
Brain TeasersMorgan StanleyBarclays
Easy93
Zero-Coupon Bond Price
FinanceGoldman SachsPIMCO
Easy49
Limit of sin(x)/x
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Easy108
Delta of a Forward
Options & GreeksOptiverIMC Trading
Easy
4
Day 4

Coding · Brain teasers · Portfolio

74
Newton’s Method for √2
Algorithms & NumericalGoldman SachsJane Street
Easy22
Flips Until First Head
ProbabilityOptiverIMC Trading
Easy83
Nim GameLeetCode
Algorithms & NumericalJane StreetSIG / Susquehanna
Easy132
Portfolio Beta
Portfolio & RiskGoldman SachsAQR Capital
Easy6
Sum 1 to 100
Brain TeasersJane StreetGoldman Sachs
Easy
5
Day 5

Calculus · Finance · Options

94
Futures Fair Value
FinanceGoldman SachsOptiver
Easy136
OLS Slope
StatisticsTwo SigmaAQR Capital
Easy38
Flips Until Two Heads in a Row
Stochastic ProcessesJane StreetCitadel
Medium54
Geometric Series
Calculus & Linear AlgebraGoldman Sachs
Easy110
Most Negative Put Delta
Options & GreeksGoldman SachsOptiver
Easy
6
Day 6

Coding · Brain teasers · Finance

65
Product of Array Except SelfLeetCode
Algorithms & NumericalTwo SigmaHRT
Medium24
Two Dice Sum to 7
ProbabilityOptiverIMC Trading
Easy9
Last Digit of 2^100
Brain TeasersGoldman SachsMorgan Stanley
Easy95
Duration & Price Sensitivity
FinanceGoldman SachsJ.P. MorganPIMCO
Easy67
Kth Largest ElementLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium
7
Day 7

Coding · Calculus · Options

55
Limit of (1+1/n)^n
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Easy112
Sign & Peak of Vega
Options & GreeksOptiverIMC Trading
Easy29
Two Children
ProbabilityGoldman SachsMorgan Stanley
Easy124
Two-Asset Portfolio Volatility
Portfolio & RiskGoldman SachsAQR Capital
Medium69
Maximum Subarray (Kadane)LeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium
8
Day 8

Brain teasers · Finance · Probability

137
Variance of a Sum
StatisticsGoldman SachsMorgan Stanley
Easy39
Gambler’s Ruin
Stochastic ProcessesJane StreetSIG / Susquehanna
Medium13
Handshakes at a Party
Brain TeasersGoldman Sachs
Easy96
Perpetuity Value
FinanceGoldman SachsJ.P. Morgan
Easy35
Expected Rolls for a Six
ProbabilityOptiverIMC Trading
Easy
9
Day 9

Coding · Brain teasers · Calculus

57
L'Hôpital — (eˣ−1)/x
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Easy113
Delta Hedging
Options & GreeksOptiverCitadel Securities
Easy70
Random Pick with WeightLeetCode
Algorithms & NumericalCitadelTwo Sigma
Medium125
Value at Risk (Normal)
Portfolio & RiskGoldman SachsMorgan StanleyMillennium Management
Medium3
Two Eggs, 100 Floors
Brain TeasersGoogleGoldman Sachs
Medium
10
Day 10

Coding · Calculus · Finance

97
Rule of 72
FinanceGoldman SachsMorgan Stanley
Easy36
At Least One Six
ProbabilitySIG / SusquehannaOptiver
Easy71
Shuffle an Array (Fisher-Yates)LeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium58
Derivative of ln(x)
Calculus & Linear AlgebraGoldman Sachs
Easy116
How Dear Can a Call Be?
Options & GreeksJane StreetAkuna Capital
Easy
11
Day 11

Coding · Brain teasers · Probability

138
Central Limit Theorem
StatisticsGoldman SachsMorgan Stanley
Easy42
Covariance of Brownian Motion
Stochastic ProcessesGoldman SachsTwo Sigma
Medium72
Best Time to Buy and Sell StockLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium20
Roll Until All Six Faces
ProbabilityGoogleTwo Sigma
Medium4
Horse Race — Top 3
Brain TeasersGoogleTwo Sigma
Medium
12
Day 12

Coding · Calculus · Finance

100
Coupon Equals Yield
FinanceGoldman SachsPIMCO
Easy75
Rand10() from Rand7()LeetCode
Algorithms & NumericalJane StreetOptiver
Medium59
Sum of First 10 Squares
Calculus & Linear AlgebraJane StreetTwo Sigma
Easy118
Find the Put from Parity
Options & GreeksGoldman SachsMorgan Stanley
Easy126
CVaR / Expected Shortfall
Portfolio & RiskAQR CapitalTwo Sigma
Medium
13
Day 13

Coding · Brain teasers · Finance

21
Birthday Problem
ProbabilityGoldman SachsCitadel
Medium7
100 Lockers
Brain TeasersGoogleTwo Sigma
Medium101
Current Yield
FinanceBarclaysMorgan Stanley
Easy76
Coin Change (DP)LeetCode
Algorithms & NumericalGoogleDE Shaw
Medium139
MLE of a Coin
StatisticsTwo SigmaDE Shaw
Easy
14
Day 14

Coding · Calculus · Options

44
Random Walk Recurrence
Stochastic ProcessesTwo SigmaDE Shaw
Medium60
Trace = Sum of Eigenvalues
Calculus & Linear AlgebraTwo SigmaGoldman Sachs
Easy119
Delta of a Deep ITM Call
Options & GreeksIMC TradingOptiver
Easy23
Drunk Passenger
ProbabilityJane StreetCitadel
Medium78
Online Stock SpanLeetCode
Algorithms & NumericalCitadel SecuritiesHRT
Medium
15
Day 15

Coding · Brain teasers · Finance

8
Poisoned Wine
Brain TeasersGoogleJane Street
Medium104
Duration and a Rate Move
FinancePIMCOBlackRock
Easy127
Diversification & Sharpe
Portfolio & RiskAQR CapitalCitadel
Medium79
Time-Based Key-Value StoreLeetCode
Algorithms & NumericalTwo SigmaJump Trading
Medium25
Bayes — Disease Test
ProbabilityGoldman SachsTwo Sigma
Medium
16
Day 16

Coding · Calculus · Options

61
Determinant = Product of Eigenvalues
Calculus & Linear AlgebraTwo SigmaDE Shaw
Easy121
Straddle Breakeven
Options & GreeksSIG / SusquehannaAkuna Capital
Easy141
Range of Correlation
StatisticsGoldman SachsCitadel
Easy45
Quadratic Variation of BM
Stochastic ProcessesGoldman SachsTwo Sigma
Medium80
Best Time to Buy and Sell Stock IILeetCode
Algorithms & NumericalOptiverJane Street
Medium
17
Day 17

Brain teasers · Calculus · Finance

10
Mislabeled Jars
Brain TeasersJane StreetOptiver
Medium106
Real Rate of Return
FinancePIMCOCitadel
Easy26
Broken Stick Triangle
ProbabilityJane StreetCitadel
Medium128
Maximum Drawdown
Portfolio & RiskCitadelTwo SigmaMan Group
Medium63
Approximate cos(0.1)
Calculus & Linear AlgebraJane StreetOptiver
Easy
18
Day 18

Coding · Brain teasers · Finance

122
Covered Call Max Profit
Options & GreeksMorgan StanleyIMC Trading
Easy81
Gas StationLeetCode
Algorithms & NumericalJane StreetCitadel
Medium11
Burning Ropes — 45 Minutes
Brain TeasersGoldman SachsMorgan Stanley
Medium91
Black-Scholes ATM Call
FinanceGoldman SachsMorgan Stanley
Medium27
Top Two Aces
ProbabilitySIG / SusquehannaOptiver
Medium
19
Day 19

Coding · Calculus · Options

82
Jump GameLeetCode
Algorithms & NumericalGoogleDE Shaw
Medium142
Variance of a Scaled Variable
StatisticsGoldman Sachs
Easy40
Expectation of GBM
Stochastic ProcessesGoldman SachsMorgan Stanley
Hard50
Eigenvalues of a 2×2
Calculus & Linear AlgebraGoldman SachsCitadel
Medium109
Gamma Near Expiry
Options & GreeksOptiverIMC Trading
Medium
20
Day 20

Coding · Brain teasers · Finance

84
Predict the WinnerLeetCode
Algorithms & NumericalJane StreetOptiver
Medium28
Hat Check
ProbabilityJane StreetDE Shaw
Medium14
Bridge Crossing
Brain TeasersGoogleJane Street
Medium92
Risk-Neutral Probability
FinanceGoldman SachsJ.P. Morgan
Medium129
Kelly Criterion
Portfolio & RiskCitadelJane Street
Medium
21
Day 21

Coding · Brain teasers · Calculus

85
LRU CacheLeetCode
Algorithms & NumericalTwo SigmaHRT
Medium51
Gaussian Integral
Calculus & Linear AlgebraGoldman SachsTwo Sigma
Medium111
Sign of Theta
Options & GreeksOptiverSIG / Susquehanna
Medium30
Expected Max of Two Dice
ProbabilityOptiverIMC Trading
Medium15
Ants on a Triangle
Brain TeasersGoldman SachsOptiver
Medium
22
Day 22

Coding · Finance · Portfolio

98
Gordon Growth Model
FinanceGoldman SachsMorgan Stanley
Medium86
Longest Increasing SubsequenceLeetCode
Algorithms & NumericalTwo SigmaDE Shaw
Medium134
Correlation of X and X²
StatisticsTwo SigmaDE Shaw
Medium43
Expected Flips for HTH
Stochastic ProcessesJane StreetSIG / Susquehanna
Hard130
VaR Time Scaling
Portfolio & RiskGoldman SachsMorgan Stanley
Medium
23
Day 23

Coding · Brain teasers · Calculus

31
Russian Roulette — Spin?
ProbabilityJane StreetCitadel
Medium52
Derivative of xˣ
Calculus & Linear AlgebraJane StreetCitadel
Medium114
Early Exercise of a Call
Options & GreeksGoldman SachsMorgan Stanley
Medium88
Course ScheduleLeetCode
Algorithms & NumericalGoogleDE Shaw
Medium16
Water Jugs
Brain TeasersGoogle
Medium
24
Day 24

Coding · Calculus · Finance

99
Implied Forward Rate
FinanceJ.P. MorganBarclays
Medium32
Expected Min of Two Dice
ProbabilityOptiverSIG / Susquehanna
Medium89
Number of IslandsLeetCode
Algorithms & NumericalGoogleTwo Sigma
Medium56
Integral of x·e^(−x)
Calculus & Linear AlgebraGoldman SachsTwo Sigma
Medium
25
Day 25

Brain teasers · Options · Statistics

115
Delta of an ATM Straddle
Options & GreeksOptiverIMC TradingSIG / Susquehanna
Medium140
Covariance of a Linear Transform
StatisticsGoldman SachsAQR Capital
Medium46
Random Walk — Expected Steps
Stochastic ProcessesJane StreetTwo Sigma
Hard17
Three Switches
Brain TeasersGoldman SachsMorgan Stanley
Medium
26
Day 26

Coding · Finance · Portfolio

102
Forward Price with a Dividend Yield
FinanceJ.P. MorganCitadel
Medium131
Minimum-Variance Weight
Portfolio & RiskAQR CapitalBlackRock
Medium66
Trapping Rain WaterLeetCode
Algorithms & NumericalJane StreetCitadel Securities
Hard33
Poisson — No Arrivals
ProbabilityTwo SigmaJump Trading
Medium
27
Day 27

Coding · Brain teasers · Calculus

68
Sliding Window MaximumLeetCode
Algorithms & NumericalHRTJump Trading
Hard62
Integrate x·eˣ
Calculus & Linear AlgebraGoldman SachsMorgan Stanley
Medium117
Value of a Box Spread
Options & GreeksOptiverCitadel Securities
Medium1
Screwy Pirates
Brain TeasersJane StreetOptiver
Hard
28
Day 28

Coding · Finance · Probability

103
FX Forward by Interest Parity
FinanceGoldman SachsBarclays
Medium34
Exponential Survival
ProbabilityDE ShawMorgan Stanley
Medium77
Median of Two Sorted ArraysLeetCode
Algorithms & NumericalGoogleTwo Sigma
Hard143
Variance of the Sample Mean
StatisticsTwo SigmaDE Shaw
Medium
29
Day 29

Calculus · Options · Portfolio

47
Expected Running Max of BM
Stochastic ProcessesGoldman SachsDE Shaw
Hard133
Annualizing Sharpe
Portfolio & RiskTwo SigmaAQR Capital
Medium53
Maximize x^(1/x)
Calculus & Linear AlgebraJane StreetSIG / Susquehanna
Hard120
Worst Case with a Protective Put
Options & GreeksBarclaysJ.P. Morgan
Medium
30
Day 30

Coding · Brain teasers · Finance

12
12 Balls, One Odd
Brain TeasersCitadelJane StreetTwo Sigma
Hard105
Present Value of an Annuity
FinanceMorgan StanleyJ.P. Morgan
Medium37
Expected Max of Two Uniforms
ProbabilityJane StreetCitadel
Medium87
Find Median from Data StreamLeetCode
Algorithms & NumericalTwo SigmaCitadel
Hard