View Compilation Error

0_0_21640985_31198.cpp:181:16: error: 'Ancestors' does not name a type
 char sss[maxn];Ancestors in Two Trees
                ^
0_0_21640985_31198.cpp: In function 'int main()':
0_0_21640985_31198.cpp:197:23: error: 'read' was not declared in this scope
             s[i]=read();
                       ^
0_0_21640985_31198.cpp:198:34: error: 'Ancestors' was not declared in this scope
             tr[0].insert(s[i],1);Ancestors in Two Trees
                                  ^
0_0_21640985_31198.cpp:208:27: error: 'read' was not declared in this scope
             qq[i].s1=read(); qq[i].s2=read();
                           ^
0_0_21640985_31198.cpp:222:23: error: 'Ancestors' was not declared in this scope
                 now++;Ancestors in Two Trees
                       ^