很好的搜索入门题

2567-Tempter of the Bone(剪枝)

2568-Asteroids

1533-Oil Deposits(DFS)

1039-Rescue

2569-Nightmare(标记)

2570-胜利大逃亡(3维DFS)

2031-Red and Black(DFS)

2331-Knight Moves双广+优先

1282-Substrings

2572-Prime Ring Problem回溯

2056-Solitaire双广

2528-Anagrams by Stack

2573-A strange lift无题