View Compilation Error

0_0_21508727_32659.cpp: In function 'int topsort()':
0_0_21508727_32659.cpp:27:19: error: expected primary-expression before '<' token
  while(!q.empty())<span style="font-family: Arial, Helvetica, sans-serif;">//使用队列中的点更新indegree[]并生成拓扑排序序列</span>
                   ^
0_0_21508727_32659.cpp:27:20: error: 'span' was not declared in this scope
  while(!q.empty())<span style="font-family: Arial, Helvetica, sans-serif;">//使用队列中的点更新indegree[]并生成拓扑排序序列</span>
                    ^