All challenges

Transform a sliding-vehicle puzzle to maximize the minimum solution length.

Identify the hidden target from a noisy membership-search instance.

Track a hidden mole on a rooted tree through subtree queries that can move the target.

Recover a hidden unordered_set bucket count through the original collision-query protocol.

Recover the hidden pair of positions from the source answer metadata.

Find the hidden pair associated with the large integer source instance.

Determine a hidden cycle size through the original Frontier-CS walk-and-guess interaction.

Report the hidden line width from the RiOI editor source instance.

Find the singleton value through membership queries over a hidden shuffled multiset.

Find an adaptively hidden absent student despite bounded dishonest replies.

Find the hidden chord in a cycle by querying shortest-path distances.

Move numbered balls between three baskets under center-ball transfer rules.