View Compilation Error

0_0_20774472_31644.cpp: In function 'int main()':
0_0_20774472_31644.cpp:26:36: error: expected primary-expression before '<' token
                 s.push(str1[++i]); <span style="font-size:24px;color:#ff0000;">//开辟了 100个 空间，不越界！！</span> 
                                    ^
0_0_20774472_31644.cpp:26:37: error: 'span' was not declared in this scope
                 s.push(str1[++i]); <span style="font-size:24px;color:#ff0000;">//开辟了 100个 空间，不越界！！</span> 
                                     ^