All challenges

Find indices holding the two median permutation values.

Report the static localization verdict for a maze-distance source instance.

Locate the maximum value in a hidden permutation using second-maximum interval queries.

Find the k-th value in a hidden sorted matrix through the original Frontier-CS query protocol.

Report hidden deposit coordinates from Manhattan-distance probe metadata.

Create binary magic words and identify ordered pairs from distinct-substring powers.

Recover hidden integer lines from Frontier-CS source instances.

Recover a hidden limited-shuffle permutation using comparison queries.

Recover a hidden cyclic lamp permutation through the original Frontier-CS adjacency interaction.

Recover a hidden permutation from interactive subarray inversion-parity queries.

Recover hidden derangements through the original Inter Active permutation query protocol.

Select two pens with enough remaining hidden ink after interactive write tests.