View Compilation Error

0_0_26641462_30641.cpp: In function 'void add(long long int&, long long int)':
0_0_26641462_30641.cpp:10:36: error: expected primary-expression before '<' token
 void add(long long &a,long long b){<span style="color:#3333ff;">//这个地方的&非常重要，相当于让主函数里的g数组也更改了</span>
                                    ^
0_0_26641462_30641.cpp:10:37: error: 'span' was not declared in this scope
 void add(long long &a,long long b){<span style="color:#3333ff;">//这个地方的&非常重要，相当于让主函数里的g数组也更改了</span>
                                     ^