100 doors to be painted
You have 100 doors to be painted and 2 painters. 1 starts at one end and paints every other door. […]
Logic Puzzles
Coding Interview Questions
5 Unbreakable Light Bulbs and a 80 Floor Building
IF You have 5 unbreakable light bulbs and a 80 floor building. Using fewest possible drops, determine how much of
Amazon Interview Questions, Arrays
Amazon Interview Question: Count Negative Integers in Matrix
2026 Update: Sorted Matrix Search — From O(mn) to O(m+n) If the matrix is sorted (rows and columns both non-decreasing),
Coding Interview Questions
Implement a Function to Return a Ratio
Implement a function to return a ratio from a double function (0.25 -> 1/4). If the function tolerance is .01
Logic Puzzles
Three People on a Weak Bridge
Three people need to cross a weak bridge at night. They have just one turn and the bridge is only
System Design
Server to Process Fair Number of Functions
How would you design a server that has to process a fair number of functions of a requests in a
Coding Interview Questions
Function that Multiples 2 Integers
Write a multiply function that multiples 2 integers without using “*”. 2026 Update: Integer Multiplication — Without Using Multiply Operator
Data Structures
Find Out if a Linked List has a Cycle
Without marking nodes, find out if a linked list has a cycle in it or not. 2026 Update: Floyd’s Cycle
Dynamic Programming
Fruit Jar Problem
You have 3 jars that are all mislabeled. One jar contains Apple, another contains Oranges and the third jar contains
Brain Teasers
A Man with Burning Ropes
A man has two ropes of varying thickness, those two ropes are not identical, they aren’t the same density nor
Coding Interview Questions
Write a Function for r and 5()
Write a function for r and 5() that returns a random int between 0 and 5, implement r and 7
Logic Puzzles
Out of 10 Coins
Out of 10 coins, one weighs less then the others. You have a scale. How will you determine which one
Math Problems
Probability of a Car Passing By
The probability of a car passing a certain intersection in a 20 minute windows is 0.9. What is the probability
Arrays, Data Structures
Missing or Duplicate Number in an Array
Write a function that will find a missing or duplicated number in an array. 2026 Update: Missing & Duplicate Number
Arrays, Data Structures, Math Problems
Probability Distribution Function
Write code to generate all possible combinations of ‘r’ elements in a given array of size ‘n’? 2026 Update: Probability