【HDU】
1285
确定比赛名次
2094
产生冠军
2647
Reward
3342
Legal or Not
1811
Rank of Tetris 拓扑+并查集
3231
Box Relations 三维拓扑
=================================================================
【POJ】
1094
Sorting It All Out Floyd+拓扑
2367
Genealogical tree
3660
Cow Contest
3687
Labeling Balls 神奇的拓扑
1128
Frame Stacking DFS版拓扑
1270
Following Orders 拓扑+回溯
1420
Spreadsheet 模拟拓扑
2762
Going from u to v or from v to u? 强连通+拓扑
3553 Task schedule
