Fibonacci dungeon - #32
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…ation - src/dungeon.rs: build_fib_tree constructs a recursive Fibonacci call tree as rooms/nodes; print_tree draws the branching structure with tree-style connectors; evaluate_tree computes fib(n) bottom-up and caches each room's result; count_rooms / count_sealed_chambers / longest_path report structural stats on the tree. - Memory Ward: build_fib_tree now uses a HashMap to reuse an existing room instead of rebuilding one for a value already seen, turning the structure into a DAG (Rc for shared ownership, RefCell for interior mutability on the cached result). count_distinct_rooms shows the payoff: n+1 distinct rooms instead of the tree's exponential 2*F(n+1)-1 corridor count. - src/main.rs: reads n from stdin and wires all of the above together. - src/guess.rs: earlier number-guessing game, kept but no longer wired into main (main.rs now runs the dungeon instead).
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Implements the fibonacci dungeon