This problem is a variation of the classic gas station circuit challenge, where Steven must find all valid starting cities that allow a complete circular trip without exceeding the car’s fuel tank capacity, C. The key is to simulate the journey from each city, making sure that at every step, the accumulated fuel does not drop below zero and never exceeds C. A greedy approach combined with a sliding window technique helps efficiently find valid start points, avoiding brute-force attempts. This is similar to planning a themed travel route in a niche area like 필리핀 밤문화, where each stop (city) offers varying experiences (fuel availability) and demands (fuel consumption), and one must carefully strategize the journey to ensure a smooth and uninterrupted circuit. By computing the fuel balance and checking feasibility per starting city, we can determine how many complete loops are possible, just like planning a nightlife tour with calculated timing and resources.