【HDU】
[强连通]:
1269  迷宫城堡 判断是否是一个强连通★
2767Proving Equivalences  至少加几条边让整个图变成强连通★
3836 Equivalent Sets  至少加几条边让整个图变成强连通★
1827    Summer Holiday  传递的最小费用★★
3072    Intelligence System  传递的最小费用★★
3861The King’s Problem 强连通+二分匹配★★
3639Hawk-and-Chicken  强连通缩点 + 树形dp（累加子节点的总权值）★★
3594 Cactus 仙人掌图★★★

[双连通]:
2242考研路茫茫——空调教室  双联通缩点+树形DP
2460Network 边双连通
3849By Recognizing These Guys, We Find Social Networks Useful  双连通求桥
3896Greatest TC  双连通
4005 The war  边双连通
3394Railway 双连通求块

[LCA]:
2586How far away ？
2874Connections between cities
3078Network  LCA+排序
3830Checkers  二分+LCA
4338 Simple Path [点连通缩块+LCA]

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【POJ】
[强连通]:
1236Network of Schools
2553 The Bottom of a Graph  好题！ 找出度为0的集合
2186    Popular Cows  好题！ 找出度为0的，其他分量都指向它的集合
2375Cow Ski Area 强连通
2762    Going from u to v or from v to u?  缩点+拓扑排序
3160   Father Christmas flymouse  强连通+最短路
3180 The Cow Prom  判断有几个环， 分量中元素大于1的个数
3114Countries in War  强连通+最短路
3592Instantaneous Transference  强连通分量+最长路
1904King's Quest  强连通+并查集

[双连通]：
3694 Network  边双连通 (同hdu2460)
3177 Redundant Paths   构造边双连通
3352 Road Construction   构造边双连通
2942 Knights of the Round Table  (点双连通经典题)
1515 Street Directions  (无向图改有向图)
1438 One-way Traffic   (混合图改有向图)

[LCA]:
1330Nearest Common Ancestors
1470Closest Common Ancestors
1986Distance Queries
3417Network
3728The merchant  LCA+RMQ(倍增法)
2763Housewife Wind  LCA+线段树(树链剖分)
1523SPF
1144Network
2117Electricity
3237Tree

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【其他OJ】
zoj 2682 People like People
foj 1719 Spy Network
http://www.spoj.pl/problems/QTREE2/  LCA查找路径第k个点
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