汽车加油问题。一辆汽车加满油后可行驶n公里。旅途中有若干个加油站。设计一个有效算法，指出应 在哪些加油站停靠加油，使沿途加油次数最少。并证明算法能产生一个最优解。-Vehicle refueling problem. Fill up after a car can travel n miles. There are a number of gas stations in the journey. Design an efficient algorithm that fuel dock in