Daybound is an iPhone app I built because I live in the UK on a visa, and the number of days I spend outside the country matters. For settlement you…
Discover is a little app I built for road trips. You put your phone on the dashboard, and while you drive it tells you about the places you are…
Memoria is a kanban board and a notebook that saves everything into a Google Sheet in your own Drive. There is no database and nothing to sign up for…
Riddle: You have 11 coins. One of them is fake, and has a different weight from the others: it can be either lighter or heavier.
Riddle: You are at the top of a 100 m cliff with a 75 m rope and a knife. A branch sticks out 50 m below. How do you get down safely?
Riddle: You are looking to your reflection in a mirror. If you move your right hand, your reflection seems to be moving its left hand. However, if you move…
Bayesian Inference from Scratch in Python
How SHAP values are computed, in a few simple Python lines
How to use background jobs to quickly queue a job after a running command
Create a nice multiprocessing logic with a loading bar
Trying out cython
The typical bayesian interview question, solved with PyMC3
Create random forest from scratch in Python
Create word embeddings simply from scratch
Simple boosting trees, for regression and classification in python from scratch
Singular value decomposition from scratch
PCA dimensionality reduction from scratch
Linear regression, ridge regression, logistic regression with r2 score from scratch in Python
Hypothesis testing, confidence interval
Riddle: Three scoundrels must split $100 by majority vote, each wanting the most money. What is the outcome? A game theory riddle I have not solved yet.
Riddle: A suitcase holds a million dollars only if a 95% accurate machine predicted you would drink the poison. Do you drink it? A version of Newcomb’s paradox.
Riddle: You are blind, with two blue pills and two red pills. You must take exactly one of each today and tomorrow. How do you do it?
Riddle: Can you find a 4 digits number that gets reversed when multiplied by 4?
Riddle: Cut a rope at two random places. What is the probability that the three pieces can form a triangle?
Riddle: A farmer has 100kg of potatoes. At the start, they are composed of 99% of water (the water is 99% of the total weight) and 1% of dry matter (the dry…
Riddle: Albert and Bernard just become friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates.
Riddle: How do you make 26 by using 5, 5, 5 and 1. You have to use each exactly once. You can use the basic math operations (+, -, *, /, (, ) ).
Riddle: Four hidden coins on a spinning quadrant, five turns, and a light that turns on only when all four match. Find a strategy that always works.
Riddle: In a far away land, it was known that if you drank poison, the only way to save yourself is to drink a stronger poison in the next 12 hours, which…
Riddle: The warden meets with 23 new prisoners when they arrive. He tells them, “You may meet today and plan a strategy. But after today, you will be in…
Riddle: A mother is 21 years older than her child. In 6 years she will be 5 times older. Where is the father? A maths riddle with a strange answer.
Riddle: There is a stack of 100 coins. Each coin has a silver side and a golden side. 20 coins are silver side up. The rest is golden side up. You are in a…
Riddle: If 3 cats take 3 minutes to catch 3 mouses, how many cats are needed to catch 100 mouses in 100 minutes ?
Riddle: If I can make it around a running track once by going 10 km/h, what speed should I be running a second lap to have an average speed of 20 km/h for the…
Riddle: Imagine a 747 is sitting on a conveyor belt, as wide and long as a runway. The conveyor belt is designed to [try to ?] exactly match the speed of the…
Riddle: The evil professor says to the students: you are going to have an exam next week. I’m not telling you which day, but I am telling you that it will be…
Riddle: You are in a square forest of side 100km. You are 2km away from its border, but you don’t know in what direction or at what angle (It could be at 2km…
Riddle: Jack is looking at Anne, but Anne is looking at George. Jack is married, but George is not. Is a married person looking at an unmarried person?
Riddle: A lady has two children. One is a boy. What are the chances of the other child also being a boy?
Riddle: Alice sees 12 trees, Bob sees 8, and neither knows the other’s count. Each day they are asked if there are 18 or 20 trees. A common knowledge puzzle.
Riddle: A group of perfect logicians with assorted eye colors live on an island. A visitor makes one remark. Who leaves the island, and when?
Riddle: Four shapes, one is the odd one out. Find the exception and explain why.
Riddle: Alice looks at five cards, hands four to Bob, and Bob names the fifth. No code, no sleight of hand. How does the trick work?
Riddle: You have a lighter and two lengths of rope that burn for exactly 1 hour each. They do not burn consistently so you cannot, for example, cut one in half…
