Programming Puzzles & Code Golf

programming puzzle enthusiasts and code golfers
Solved Questions
Unsolved Questions
  1. Be as fair as possible
  2. Output the language name times the number of characters
  3. Is a number divisible by each of its digits?
  4. Generate a Texting Dictionary
  5. Is it a pleasing number?

  6. Greatest Common Divisor

  7. Delete the first periodic digit

  8. You've got a book to make!
  9. I double the source, you double the output!
  10. Is this word Lexically Ordered?
  11. Unicode Fractions

  12. The leading zeroes challenge
  13. Clearing the most significant bit from an integer
  14. Golf all the 16 logic gates with 2 inputs and 1 output!

  15. Sum of all integers from 1 to n

  16. Modulus Summation

  17. Cartesian product of two lists

  18. String Permutations - case and order
  19. Frequency Distribution of Multiple Dice Rolls
  20. Numbers that are actually letters
  21. Partition a list!
  22. Is this a valid variable name?

  23. The last stage of contamination
  24. Parity of a Permutation

  25. 0.0000000000000000001
  26. Duck, Duck, Josephus

  27. Recamán's fibonacci is triangular

  28. Help the dealer rebuild the deck

  29. Tips for golfing in C++

  30. Stay away from zero
  31. Parse a list of signed unary numbers

  32. Full Width Text
  33. Count of relatively prime partitions

  34. Subtract my odds from my evens
  35. Is this a three-digit number ending in one?
  36. Make a Plain PIE!

  37. Find the closest palindromic number

  38. Sample the Pareto Distribution

  39. One OEIS after another

  40. Random Capitalization

  41. Electron Configuration

  42. Black and White Rainbows
  43. Is this site down or is it just me?
  44. Make a ;# interpreter

  45. Detect rotated strings

  46. Tips for golfing in Haskell

  47. Create output twice the length of the code

  48. Balance chemical equations!

  49. Is the number binary-heavy?

  50. It's a double+ header!

  51. Intersection of two triangles

  52. Notcalc (Calculate the wrong answer)
  53. Answer to life, the universe, and everything

  54. The shortest code to invert a binary string

  55. Binary Sequences

  56. Coprimes up to N

  57. How do I exit Vim?
  58. Characteristic polynomial

  59. Is this number a prime?

  60. Visualize Merge Sort

  61. Play a game of Dice Cricket

  62. Append and erase

  63. Reverse two sections of a string around a pivot

  64. Encode Factor Trees
  65. Decode Factor Trees

  66. Proving you are the best StackExchange-User
  67. Make the PPCG Favicon

  68. First and last prime numbers with prime digits of range

  69. Hofstadter H-sequence

  70. Palindrome Hello, World
  71. Josephus problem with three inputs
  72. Find primitive semiperfect numbers

  73. Collatz Conjecture (OEIS A006577)
  74. My Squiggly Lamp

  75. "Hello, World!" (Cops' thread)

  76. Turing complete language interpreter code golf
  77. Build a fewest-moves freecell solver
  78. Count number of hefty decimals between 2 numbers

  79. Eigenvalues of a Matrix

  80. Tell me when the next post is... WebSockets!
  81. Print a word clock

  82. Declare a Code Golf Winner
  83. Generate Pascal's triangle

  84. Advent Challenge 5: Move the presents to the transport docks!
  85. Calculate the lowest number where the sum of the sequence of numbers exceeds a given value

  86. Dutch Burgerservicenummer (BSN) eleven-test
  87. Prove me wrong!
  88. Keep Decoding This Number!

  89. Find the Needle in the Haystack (Robbers)

  90. Raise integer x to power x, without exponentiation built-ins

  91. Construct a polynomial with given roots

  92. Discrete Convolution or Polynomial Multiplication
  93. Tips for golfing in MATLAB
  94. Print the Nth non-palindromic number

  95. Download all StackExchange git repos

  96. Make an alphabet searchlight!

  97. Tips for golfing in Clojure

  98. Output a Magical 8 Trapezium
  99. Generate Pyramid Scheme code
  100. Tips for golfing in tinylisp