A single, well-chosen problem each day — no streaks, no timers, no leaderboard. It rotates at midnight UTC and cycles from novice fundamentals to expert systems thinking.
July 14, 2026 · Novice · iteration
~12 min
Choose the repetition
Coding starts with recognizing repeated work before choosing syntax.
Prompt
A list contains five lesson titles. You need to print each title once. Describe the steps a computer should follow, then name the kind of programming structure you would use.