2010年12月16日
Bridge over a rough river
摘要： DescriptionA group ofNtravelers (1 ≤N≤ 50) has approached an old and shabby bridge and wishes to cross the river as soon as possible. However, there can be no more than two persons on the bridge at a time. Besides it's necessary to light the way with a torch for safe crossing but the group has only 阅读全文
posted @ 2010-12-16 09:49 kelin1314 阅读(361) 评论(0) 推荐(0)