View Compilation Error

0_0_35017361_18362.cpp: In function 'int main()':
0_0_35017361_18362.cpp:16:22: error: expected primary-expression before '<' token
   for(i=m-1;i>=1;i--)<span style="white-space:pre">  </span>//从倒数第二层开始
                      ^
0_0_35017361_18362.cpp:16:23: error: 'span' was not declared in this scope
   for(i=m-1;i>=1;i--)<span style="white-space:pre">  </span>//从倒数第二层开始
                       ^