View Compilation Error

0_0_32341305_3718.cpp: In function 'int main()':
0_0_32341305_3718.cpp:13:21: error: expected primary-expression before '<' token
   for(i=0;i<len;i++)<span style="white-space:pre">   </span>//用数组a存下字母
                     ^
0_0_32341305_3718.cpp:13:22: error: 'span' was not declared in this scope
   for(i=0;i<len;i++)<span style="white-space:pre">   </span>//用数组a存下字母
                      ^
0_0_32341305_3718.cpp:32:19: error: expected primary-expression before '<' token
   for(i=0;i<k;i++)<span style="white-space:pre">   </span>//去除相同的单词
                   ^
0_0_32341305_3718.cpp:32:20: error: 'span' was not declared in this scope
   for(i=0;i<k;i++)<span style="white-space:pre">   </span>//去除相同的单词
                    ^