View Compilation Error

0_0_33509160_32723.cpp: In function 'int main()':
0_0_33509160_32723.cpp:53:8: error: expected primary-expression before '<' token
        <span style="white-space:pre"> </span>//a为入度大出度1的点的个数，b为出度大入度1的点的个数
        ^
0_0_33509160_32723.cpp:53:9: error: 'span' was not declared in this scope
        <span style="white-space:pre"> </span>//a为入度大出度1的点的个数，b为出度大入度1的点的个数
         ^
0_0_33509160_32723.cpp:54:25: error: expected ';' before ')' token
   for(i = 0; i < 30; i++)                       //判连通
                         ^