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 which gas stations, so along the way to refuel the least number of. And prove that the algorithm can produce an optimal solution.