简单环判断
A1123 Is It a Complete AVL Tree (30 point(s))
AVL树建立+完全二叉树判断
A1124 Raffle for Weibo Followers (20 point(s))
map充当散列
A1125 Chain the Ropes (25 point(s))
贪心--取最大长度
A1126 Eulerian Path (25 point(s))
连通图判断,图的度统计
A1127 ZigZagging on a Tree (30 point(s))
中序+后序=层序
A1128 N Queens Puzzle (20 point(s))
N皇后--判断对角线上行差值==列差值
A1129 Recommendation System (25 point(s))
Set的应用--值不重复,值的个数增加
A1130 Infix Expression (25 point(s))
树的中序遍历+根结点的查找
A1131 Subway Map (30 point(s))
DFS应用