Past Problems

Below you’ll find past programming problems for each “week”, or unit, of CS50. These problems were used in an earlier version of the course.

Week 1

• Fahrenheit
• Hello
• ISBN
• Pennies

Week 2

• Calc
• Crack
• Old Friends
• Vigenère

Week 3

• Fifteen

Week 4

• Resize, for those less comfortable
• Resize, for those more comfortable
• Whodunit

Week 5

• Speller, with a trie

Week 6

• Analyze This
• Bleep
• Sentimental
  • Caesar, for those less comfortable
  • Vigenère, for those less comfortable
  • Crack, for those more comfortable