华为软件精英挑战赛
成绩排名： 初赛京津东北赛区82名
题意： 给定一个有向图，求出图中所有长度在[3,7]之间的环。
输入： 格式为[IDU,IDV,Weight]的边表，ID为32位无符号整数（当然题目说明了，小于2^31，所以int32就好），边最多28W条，不重复，结点平均度数小于10。环中同一个ID不可以重复出现（若大环包括小环，则需要分开统计），环的个数不大于300W。
输出： 环的个数，按照1.环长度；2.环的数字字典序输出所有环。
例子： 1,2,3的全连通图有两个符合题意的环
策略： dfs, 先正向遍历3层，再反向遍历3层标记节点。将搜索空间缩小，另外，最后一层的节点前驱做标记，遍历到第6个点时，提前做判定，不进入最后一层。6+1=7
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