FA-92849 / EV charging session scheduling / Member archive

Time-of-use cheapest slot plan: equal-price tie-break · case 04

With a flat tariff the plan charges at the end of the stay instead of as early as possible.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

prices[i] is the tariff in cents/kWh of 15-minute slot i. The car is present for slots arrive..depart-1 (depart exclusive) clipped to the tariff horizon; arrive may be negative. Each slot delivers at most max_w//4 Wh. Fill the cheapest slots first (equal price: earlier slot first), the last slot partially. Return [[slot, wh] sorted by slot, cost in millicents (sum wh*price), unmet wh]. need_wh<=0 or max_w<=0 returns [[], 0, max(need_wh,0)].

Why this case matters

Depot, workplace and public EV chargers schedule sessions against prices, circuit limits and departure deadlines; a wrong decision silently strands a driver or overloads a feeder.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: equal-price tie-break	`[[[3, 2750], [4, 1250]], 34500, 0]`	`[[[2, 1250], [3, 2750]], 34500, 0]`	Failed

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