2-Visits is strongly NP-complete for multiplicity 2 but in RP for constant distinct deadlines, with a 0.9142 density lower bound for 2-Visits and thresholds approaching 5/6 for large k.
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Hardness, Tractability and Density Thresholds of finite Pinwheel Scheduling Variants
2-Visits is strongly NP-complete for multiplicity 2 but in RP for constant distinct deadlines, with a 0.9142 density lower bound for 2-Visits and thresholds approaching 5/6 for large k.