排序
A1013 Battle Over Cities (25 point(s))
DFS求连通图
A1014 Waiting in Line (30 point(s))
queue
A1015 Reversible Primes (20 point(s))
D进制的回文判断
A1016 Phone Bills (25 point(s))
电话服务
A1017 Queueing at Bank (25 point(s))
queue
A1018 Public Bike Management (30 point(s))
Dijskstra
A1019 General Palindromic Number (20 point(s))
D进制下的数是否是回文
A1020 Tree Traversals (25 point(s))
后+中=层
A1021 Deepest Root (25 point(s))
DFS求最深叶结点