I'll use this topic to keep track of the different programming exercises we have running on this forum.
  1. WordCount
  2. Fibonacci sequence
  3. LebInt
  4. FizzBuzz
  5. SQL-like interpreter
  6. Pixel Time
  7. Circular Equivalence Sets on Array
  8. 10001st Prime Number
  9. Rotating arrays
  10. Polish Calculator
  11. Text Processing and more
  12. Overlapping Rectangle Sum
  13. Walking the Bridge
  14. Polish Calculator Extra
  15. Arithmetic Grid
  16. Brainfuck Interpreter
  17. File stats
  18. Finding the pair
  19. Team Balancing
  20. Self Insertion
  21. Super Self Insertion
  22. Pointer arithmetics
  23. Decimal to Roman converter
  24. Brainfuck Exercises
  25. Remove C comments
  26. Tabs and space
  27. Gray Code
  28. WordCount2
  29. Permutations/Combinations
  30. Workflow Textual Representation
  31. Vanilla XML Builder
  32. Pascal's Triangle
  33. Basic CSS Rules Validator
  34. Morris Number Sequence
  35. String Indexer
  36. Recursion, iteration, exponentiation.
  37. Condition Symmetry
  38. Comparing 2 CSV Files
  39. Decimal multiplication
  40. Approximating Pi
  41. Approximating Pi - Monte Carlo Analysis
  42. Arithmetical computation
  43. Time converter
  44. Delivery Center
  45. SQL Record History
  46. C predicates
  47. Swapping without using temp variable
  48. Russian lucky bus ticket
  49. Large sums
  50. Improving performance through caching
  51. Max Swaps
  52. Generate brainfuck strings
  53. Triangle numbers divisors
  54. N-th fractional part of an irrational number
  55. Braces
  56. A functional programming library
  57. Parsing S-expressions
  58. Total number of Sudoku solutions
  59. Is this list a sublist?
  60. Flatten nested sequence
  61. Array Sandwiches
  62. Letter Diamonds
  63. Tic Tac Toe
  64. Spell Checker
  65. Walk the grid
  66. Equilibrium index
  67. Alien Language Pattern Matching
  68. Implementing sets
  69. A function composition question
  70. More on function composition
  71. Happy Birthday golf
  72. Iterative traversal of nested mappings
  73. Grouping numbers
  74. Basket Ball
  75. Phone Keypad
  76. Alphabet Stickers
  77. Similar Integers
  78. Mini Template Processor
There are no deadline whatsoever to do these exercises. Do not hesitate to rehash these topics, even if they're years old. Also remember, it is not a competition. The intended purpose is to practice, share code, get feedback.