View Compilation Error

0_0_22967899_3890.cpp:17:11: error: expected unqualified-id before '<' token
 double an;<span style="white-space:pre">      </span>//容易出问题
           ^
0_0_22967899_3890.cpp: In function 'int unin(int, int)':
0_0_22967899_3890.cpp:25:18: error: 'getfa' was not declared in this scope
     int A=getfa(a);
                  ^
0_0_22967899_3890.cpp: In function 'long long int kru()':
0_0_22967899_3890.cpp:46:24: error: 'getfa' was not declared in this scope
         if(getfa(e[i].x)!=getfa(e[i].y))
                        ^
0_0_22967899_3890.cpp: In function 'long long int dfs(int, int)':
0_0_22967899_3890.cpp:66:39: error: expected primary-expression before '<' token
         an+=(double)(n-sz[c])*sz[c]*d;<span style="white-space:pre">    </span>//容易出问题
                                       ^
0_0_22967899_3890.cpp:66:40: error: 'span' was not declared in this scope
         an+=(double)(n-sz[c])*sz[c]*d;<span style="white-space:pre">    </span>//容易出问题
                                        ^