摘要： River Crossing时间限制：1000 ms | 内存限制：65535 KB难度：4描述Afandi is herding N sheep across the expanses of grassland when he finds himself blocked by a river. A single raft is available for transportation.Afandi knows that he must ride on the raft for all crossings, but adding sheep to the raft makes it trave 阅读全文