设置了n个游艇出租站1~你，游客可在这些出租站间出租游艇，并在下游任一出租站归还。出租站i到j间的租金r(i,j).计算从出租站1到n所需的最少租金-Set of n 1 to your yacht rental station, visitors can rent a yacht between these rental station and return any rental station downstream. Rental station i to rent between r j (i, j). Calculate minimum lease rental required from 1 to n station