USACO3.4.2--American Heritage
摘要:
American HeritageFarmer John takes the heritage of his cows very seriously. He is not, however, a truly fine bookkeeper. He keeps his cow genealogies as binary trees and, instead of writing them in graphic form, he records them in the more linear `tree in-order' and `tree pre-order' notation 阅读全文
posted @ 2013-03-15 17:19 仗剑奔走天涯 阅读(244) 评论(0) 推荐(0) 编辑