View Compilation Error

0_0_24908750_29886.cpp: In function 'bool check(int, int)':
0_0_24908750_29886.cpp:71:14: error: invalid types 'int[int]' for array subscript
   u = fa[u][0];
              ^
0_0_24908750_29886.cpp:76:14: error: invalid types 'int[int]' for array subscript
   v = fa[v][0];
              ^