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Puzzles

50 posts

Mathematical Puzzles

Last Updated: 04 September 2025

Mathematical puzzles have always been a source of joy, mental stimulation, and problem-solving challenges. They not only enhance logical thinking but also build problem-so...read more

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Crossword Puzzle Of The Week #33(Chessboard Problems)

Last Updated: 23 July 2025

In this issue of Crossword Puzzle of the Week, we will dive into the topic of Chessboard Problems. The solution to the crossword puzzle is provided at the end.Crossword #3...read more

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Crossword Puzzle

Crossword Of The Week

chessboard-problems

Puzzle | Train Compartment

Last Updated: 15 September 2025

A train has 11 compartments. In any three consecutive compartments, there are exactly 84 people. If there are 321 people in total, how many people are in the 9th compartme...read more

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Logical Reasoning

Crossword Puzzle Of The Week #1 (for DSA)

Last Updated: 23 July 2025

In this issue of Crossword Puzzle of the week, we will dive into the topics of Data Structures and Algorithms (DSA). The solution to the crossword puzzle is provided at th...read more

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Crossword Puzzle

Crossword Of The Week

Puzzle | How much money did the man have before entering the bank?

Last Updated: 18 January 2023

Problem Statement:Suppose a man had some amount in his wallet, he knows a bank that doubles the money immediately but the fee at the entrance of the bank is Rs 1000 and Rs...read more

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Analytical Mathematical Puzzles

Count of 1's after flipping the bits at multiples from 1 to N

Last Updated: 23 July 2025

Given N sized binary array A[] containing all 0's initially. The task is to find the final count of 1's after flipping the bits at multiples from 1 to N.Examples:Input: A[...read more

Geeks Premier League

Geeks-Premier-League-2022

Minimize operations to make both arrays equal by decrementing a value from either or both

Last Updated: 23 July 2025

Given two arrays A[] and B[] having N integers, the task is to find the minimum operations required to make all the elements of both the array equal where at each operatio...read more

Check if a number can be represented as the sum of numbers with at least one digit equal to K

Last Updated: 23 July 2025

Given integers N and K, the task is to check if a number can be represented as the sum of numbers that have at least one digit equal to K.Example:Input: N = 68, K = 7Outpu...read more

Minimize swaps to rearrange Array such that remainder of any element and its index with 3 are same

Last Updated: 23 July 2025

Given an array arr[]. The task is to minimize the number of swaps required such that for each i in arr[], arr[i]%3 = i%3. If such rearrangement is not possible, print -1.E...read more

Modular Arithmetic

array-rearrange

Puzzle | Splitting a Cake with a Missing Piece in two equal portion

Last Updated: 19 September 2025

Three friends ordered a rectangular cake. One of them was in a hurry, so he cut a rectangular piece from the cake. The piece could be of any arbitrary size(less than the s...read more

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Aptitude-Puzzles

Minimum number of Apples to be collected from trees to guarantee M red apples

Last Updated: 23 July 2025

There are different kinds of apple trees in the four directions (East, West, North, South), which may grow both red and green apples such that each tree grows exactly K ap...read more

Puzzle | Distribute the Water

Last Updated: 20 March 2024

Problem Statement: Suppose there are three containers; container I (3L), container II (5L), container III (8L). Container III is filled with 8L of water while the other tw...read more

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Logical Puzzles

Algorithm to solve Rubik's Cube

Last Updated: 26 June 2025

A Rubik's Cube is an interesting puzzle invented by Erno Rubik, which has 43 quintillion possible configurations. But with the use of certain algorithms, it can be solved ...read more

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Tower of Hanoi | Set 2

Last Updated: 23 July 2025

Given a positive integer N representing the number of disks in the Tower of Hanoi, the task is to solve the Tower of Hanoi puzzle using Binary representations.Examples:Inp...read more

binary-representation

Mean of fourth powers of first N natural numbers

Last Updated: 23 July 2025

Given a positive integer N, the task is to find the average of the fourth powers of the first N natural numbers.Examples:Input: N = 3Output: 32.6667Explanation:The sum of ...read more

Sequence and Series