Question
A car starts with start_fuel liters and wants to reach a destination target miles away (1 mile costs 1 liter). Along the way there are gas stations given as [position, fuel], meaning at that mile-marker the car can pick up that many liters. The tank is unlimited. Return the minimum number of refueling stops needed to reach the target, or -1 if it cannot reach it. Stations are sorted by position and there are at most 500 of them.
min_refuel_stops(target: int, start_fuel: int, stations: list[list[int]]) → int[100,10,[[10,60],[20,30],[30,30],[60,40]]]out2State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.