A dichotomy for path-containment problems shows some are solvable with linear queries while others are equivalent to cycle problems and admit a quantum-walk algorithm with query complexity Õ(n^{3/2 - α_k}) where α_k decays exponentially in k, plus a conditional lower bound.
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Quantum algorithms for path and cycle containment problems
A dichotomy for path-containment problems shows some are solvable with linear queries while others are equivalent to cycle problems and admit a quantum-walk algorithm with query complexity Õ(n^{3/2 - α_k}) where α_k decays exponentially in k, plus a conditional lower bound.