View Compilation Error

0_0_24908747_25137.cpp: In function 'int lca(int, int)':
0_0_24908747_25137.cpp:48:6: error: 'dep' was not declared in this scope
   if(dep[top[u]] < dep[top[v]]) swap(u, v);
      ^
0_0_24908747_25137.cpp:51:9: error: 'dep' was not declared in this scope
  return dep[u] < dep[v] ? u : v;
         ^
0_0_24908747_25137.cpp: In function 'bool check(int, int)':
0_0_24908747_25137.cpp:71:14: error: invalid types 'int[int]' for array subscript
   u = fa[u][0];
              ^
0_0_24908747_25137.cpp:76:14: error: invalid types 'int[int]' for array subscript
   v = fa[v][0];
              ^