View Compilation Error

0_0_37738170_32439.cpp: In function 'void work()':
0_0_37738170_32439.cpp:103:17: error: 'add' was not declared in this scope
         add(i, x), add(x, i);
                 ^
0_0_37738170_32439.cpp:105:18: error: 'dfs1' was not declared in this scope
     dfs1(1, -1, 1);
                  ^
0_0_37738170_32439.cpp:106:14: error: 'dfs2' was not declared in this scope
     dfs2(1, 1);
              ^
0_0_37738170_32439.cpp:114:32: error: 'update_path' was not declared in this scope
             update_path(1, x, A);
                                ^
0_0_37738170_32439.cpp:119:32: error: 'update_path' was not declared in this scope
             update_path(1, x, B);
                                ^
0_0_37738170_32439.cpp:124:32: error: 'update_subtree' was not declared in this scope
             update_subtree(x, C);
                                ^