detect cycle in graph

- { + for(intj=0; J//each point connected to x - { +cnt[vect[a[i]][j]]--; A if(!cnt[vect[a[i]][j]])//only those points that have changed are likely to be in degrees 0. at B.push_back (Vect[a[i]][j]); - } - vect[a[i]].clear (); - } - a.clear (); - if(!b.empty ()) A.insert (A.end (), B.begin (), B.end ()); in } - for(intI=1; I) to { + if(cnt[i]>0) - return false; the } * return t

ArticleDirectory One more thing Problems caused by calling one-to-multiple associations through WebService: a cycle is detected in the object graph Exception details: Org. Apache. cxf. Interceptor. fault: Checking alling error: a cycle is detected in the object graph. This will cause infinitely deep

Test instructions: Give you an no-map to determine if there is a ring of length k.Idea: DFS traversal has a ring with a length of k at each point as the starting point. Now in DFS (NOW,LAST,STEP) represents the current point, last represents the previous point of access, step is a record path length counter, and S "I" records the path length from the starting point to the I point. If a point is accessed a second time, then the ring appears, judging the current path length and whether it is the f