ACM模板——拓扑排序
暂时
1 bool topo() 2 { 3 int count = 0 ; 4 while (!q.empty()) 5 q.pop(); 6 for (int i = 1; i <= n; i++) 7 if (!in[i]) 8 q.push(i); 9 while (!q.empty()) 10 { 11 int begin = q.front() ; 12 q.pop(); 13 count ++ ; 14 for (int i = 0; i < course[begin].size(); i ++) 15 if (--in[course[begin][i]]==0) 16 q.push(course[begin][i]) ; 17 } 18 if(count == n) 19 return true; 20 else 21 return false; 22 }