River Crossing with Alice and her company (River Crossing Puzzle 1)

   Five people - Alice, Bob, Carlos, Diana, and Elena - must cross a river in a small boat. The boat can only hold three people at a time. The following conditions apply:

* Alice refuses to be in the boat with Carlos

* Bob and Diana must travel together if either one is in the boat

* Elena can only operate the boat when Carlos is not present

* At least one person in each crossing must know how to operate the boat

* Only Bob, Carlos, and Elena know how to operate the boat

Infer an efficient plan.

step-by-step

Check Step 1 (chain of thought)

Change Step 1

Improve efficiency by changing Step 7

Fix violation at Step 8

Try ChatGPT o1 reasoning, verified by Claude using REACT (it works.)

Try ChatGPT 4o, failure verified by Claude