Programming Puzzle Solutions

Project Euler

1. Project Euler Solution #1: Multiples of 3 and 5
2. Project Euler Solution #2: Even Fibonacci numbers
3. Project Euler Solution #3: Largest prime factor
4. Project Euler Solution #4: Largest palindrome product
5. Project Euler Solution #5: Smallest multiple
6. Project Euler Solution #6: Sum square difference
7. Project Euler Solution #7: 10001st prime
8. Project Euler Solution #8: Largest product in a series
9. Project Euler Solution #9: Special Pythagorean triplet
10. Project Euler Solution #10: Summation of primes
11. Project Euler Solution #11: Largest product in a grid
12. Project Euler Solution #12: Highly divisible triangular number
13. Project Euler Solution #13: Large sum
14. Project Euler Solution #14: Longest Collatz sequence
15. Project Euler Solution #15: Lattice paths
16. Project Euler Solution #16: Power digit sum
17. Project Euler Solution #17: Number letter counts
18. Project Euler Solution #18: Maximum path sum I
19. Project Euler Solution #19: Counting Sundays
20. Project Euler Solution #20: Factorial digit sum
21. Project Euler Solution #21: Amicable numbers
22. Project Euler Solution #22: Names scores
23. Project Euler Solution #23: Non-abundant sums
24. Project Euler Solution #24: Lexicographic permutations
25. Project Euler Solution #25: 1000-digit Fibonacci number
26. Project Euler Solution #26: Reciprocal cycles
27. Project Euler Solution #27: Quadratic primes
28. Project Euler Solution #28: Number spiral diagonals
29. Project Euler Solution #29: Distinct powers
30. Project Euler Solution #30: Digit fifth powers
31. Project Euler Solution #31: Coin sums
32. Project Euler Solution #32: Pandigital products
33. Project Euler Solution #33: Digit cancelling fractions
34. Project Euler Solution #34: Digit factorials
35. Project Euler Solution #35: Circular primes
36. Project Euler Solution #36: Double-base palindromes
37. Project Euler Solution #37: Truncatable primes
38. Project Euler Solution #38: Pandigital multiples
39. Project Euler Solution #39: Integer right triangles
40. Project Euler Solution #40: Champernowne's constant
41. Project Euler Solution #41: Pandigital prime
42. Project Euler Solution #42: Coded triangle numbers
43. Project Euler Solution #43: Sub-string divisibility
44. Project Euler Solution #44: Pentagon numbers
45. Project Euler Solution #45: Triangular, pentagonal, and hexagonal
46. Project Euler Solution #46: Goldbach's other conjecture
47. Project Euler Solution #47: Distinct primes factors
48. Project Euler Solution #48: Self powers
49. Project Euler Solution #49: Prime permutations
50. Project Euler Solution #50: Consecutive prime sum
51. Project Euler Solution #52: Permuted multiples
52. Project Euler Solution #55: Lychrel numbers
53. Project Euler Solution #56: Powerful digit sum
54. Project Euler Solution #57: Square root convergents
55. Project Euler Solution #58: Spiral primes
56. Project Euler Solution #59: XOR decryption
57. Project Euler Solution #62: Cubic permutations
58. Project Euler Solution #63: Powerful digit counts
59. Project Euler Solution #64: Odd period square roots
60. Project Euler Solution #67: Maximum path sum II
61. Project Euler Solution #69: Totient maximum
62. Project Euler Solution #71: Ordered fractions
63. Project Euler Solution #72: Counting fractions
64. Project Euler Solution #81: Path sum: two ways
65. Project Euler Solution #92: Square digit chains
66. Project Euler Solution #107: Minimal network

CodinGame

• 1D Bush Fire
• ANEO Sponsored Puzzle
• Apple tree
• ASCII Art
• Bag of Balls
• Balanced ternary computer: encode
• Bank Robbers
• Bender - Episode 1
• Bender - Episode 3
• Benford's law
• Binary Permutations
• Block Number Sequence
• Blowing Fuse
• Caesar Box
• CGFunge interpreter
• CGX Formatter
• Chuck Norris
• Conway Sequence
• Create the longest sequence of 1s
• Darts
• Dead men's shot
• Defibrillators
• Digit sum successor
• Disks intersection
• Divide the factorial
• Divisibility windows
• Don't Panic - Episode 1
• Dwarfs standing on the shoulders of giants
• Egyptian multiplication
• Execution Circle
• Expand the polynomial
• Factorial vs Exponential
• Fill the Square!
• Genome Sequencing
• Goro Want Chocolate
• Highest truncated pyramid
• Horse-racing Duals
• Horse-racing Hyperduals
• ISBN Check digit
• Lumen
• Magic count of numbers
• Mars Lander - Episode 1
• Mayan Calculation
• Merlin's Magic Square
• MIME Type
• Minimal Ball Cost
• Minimal number of swaps
• Mystery sums
• Network Cabling
• Next car license plate
• Number of letters in a number - Binary
• Number of Network Hosts
• Number staircase
• Numeral system
• Offset Arrays
• Onboarding
• Pirate's treasure
• Power of Thor - Episode 1
• Pyramid height
• Recurring Decimals
• Roller Coaster
• Rubik
• Scrabble
• Shadows of the Knight - Episode 1
• Simple fraction to mixed number
• Simultaneous Ages
• Skynet Revolution - Episode 1
• Stock Exchange Losses
• Sum of divisors
• Super Computer
• Surface
• TAN Network
• Teads Sponsored Contest
• Telephone Numbers
• Temperatures
• The Descent
• The Fastest
• The Gift
• The greatest element
• The greatest number
• The Holy Grail
• The Last Crusade - Episode 1
• The Resistance
• The River I.
• The River II.
• The Travelling Salesman Problem
• Vortex
• War
• Magic stones

HackerRank

• Hackerrank Solution: Anti-Palindromic Strings
• Hackerrank Solution: Best Divisor
• Hackerrank Solution: Circle City
• Hackerrank Solution: Closest Number
• Hackerrank Solution: Connecting Towns
• Hackerrank Solution: Counting Valleys
• Hackerrank Solution: Easy GCD
• Hackerrank Solution: Easy sum
• Hackerrank Solution: Equations
• Hackerrank Solution: Even Odd Query
• Hackerrank Solution: Find the Point
• Hackerrank Solution: Jumping on the Clouds
• Hackerrank Solution: Leonardo's Prime Factors
• Hackerrank Solution: Little Gaurav and Sequence
• Hackerrank Solution: Little Panda Power
• Hackerrank Solution: Manasa and Factorials
• Hackerrank Solution: Maximizing XOR
• Hackerrank Solution: Minimum Height Triangle
• Hackerrank Solution: Recursive Digit Sum
• Hackerrank Solution: Repeated String
• Hackerrank Solution: Restaurant
• Hackerrank Solution: Sherlock and Array
• Hackerrank Solution: Sherlock and Divisors
• Hackerrank Solution: Sherlock and GCD
• Hackerrank Solution: Sherlock and Pairs
• Hackerrank Solution: Sherlock and Permutations
• Hackerrank Solution: Sherlock and Squares
• Hackerrank Solution: Special Multiple
• Hackerrank Solution: Summing the N series
• Hackerrank Solution: Sum vs XOR
• Hackerrank Solution: The Great XOR

ACM

• Acm Solution: Turn All the Lights Off

CodeSignal

• Codesignal Solution: alienShip
• Codesignal Solution: Bottles_1
• Codesignal Solution: Bottles_2
• Codesignal Solution: caesarian
• Codesignal Solution: circumcircle
• Codesignal Solution: Complete the Sequence
• Codesignal Solution: Computer Units to Byte
• Codesignal Solution: extendedFibonacci
• Codesignal Solution: Factorial
• Codesignal Solution: FaroShuffles
• Codesignal Solution: fibonacciWord
• Codesignal Solution: Grouped Bits
• Codesignal Solution: Is Permutation Of
• Codesignal Solution: isTournament
• Codesignal Solution: Matrix Perimeter
• Codesignal Solution: maxBits
• Codesignal Solution: Minimum Jump To Reach End
• Codesignal Solution: monkeyBars
• Codesignal Solution: Near Square
• Codesignal Solution: nextSquare
• Codesignal Solution: No odd Digits
• Codesignal Solution: nthPlace
• Codesignal Solution: offsets
• Codesignal Solution: onesPosition
• Codesignal Solution: Only Survivor
• Codesignal Solution: Poker Chips
• Codesignal Solution: primeClimb
• Codesignal Solution: reciprocal
• Codesignal Solution: sumOdious
• Codesignal Solution: surviveIt
• Codesignal Solution: totalBinSum
• Codesignal Solution: TwoFive

Misc Puzzles

• Advent calendar motifs
• An interesting Limit
• Cracking Apple Interview Question
• Division with remainder
• Find the Parity of the Sum of floor(n/k) from k=1 to n
• Inscribed Squares
• Number Guessing
• Pre-School Math Problem
• Probability to win in a Tombola
• Solution to the Water Jug Problem
• Solve exponential equation \(6^x + 4^x = 9^x\)
• Solve exponential equation \(x^y = y^x\)
• Sum of Digit-Sums between one and a million
• The rope around the equator
• Three Digits Number
• Tipping Point Problem

SkillValue

• Skillvalue Solution: Cells' Division
• Skillvalue Solution: Decrypt the enigma
• Skillvalue Solution: Even Position
• Skillvalue Solution: Find the Link
• Skillvalue Solution: Minimum Gates
• Skillvalue Solution: Smaller Primes

Spotify

• Spotify Solution: Best Before
• Spotify Solution: Reverse Number in Binary