Lemma practice generator frog-swap #61,737 · Puzzles · Moving-piece puzzles
Leaping frogs
238 red frogs sit in a row facing right, then one empty lily pad, then 206 green frogs facing left. A frog may slide onto an adjacent empty pad or jump over one frog of the other colour onto an empty pad; frogs never move backwards. What is the least number of moves to swap the two groups?
Stuck? A gentle nudge
No hints for this one.
Your answer
Loading the math keyboard…
Type naturally — sqrt, pi, / and ^ become notation. Any equivalent form is accepted. Press Enter to check.