Donaldson R F Higher or Lower
We've picked a secret number between 1 and 100. Guess it in as few tries as possible.
Enter a guess between 1 and 100.
Best strategy
With higher/lower feedback, the fastest approach is a binary search: always guess the midpoint of the range that's still possible. Starting with 50, then 25 or 75, and so on, you can always find a number from 1–100 in at most 7 guesses.