View Compilation Error

0_0_17835926_7681.cpp:35:15: error: field 'ch' has incomplete type 'node [2]'
  node *f, ch[2];
               ^
0_0_17835926_7681.cpp: In member function 'void lct::splay(node*)':
0_0_17835926_7681.cpp:101:10: error: 't' was not declared in this scope
   S[0] = t;
          ^
0_0_17835926_7681.cpp: In function 'int main()':
0_0_17835926_7681.cpp:174:19: error: 'eu' was not declared in this scope
    scanf("%d%d", &eu[i], &ev[i]);
                   ^
0_0_17835926_7681.cpp:174:27: error: 'ev' was not declared in this scope
    scanf("%d%d", &eu[i], &ev[i]);
                           ^
0_0_17835926_7681.cpp:182:15: error: 'eu' was not declared in this scope
    t.link(c + eu[i], c + ev[i]);
               ^
0_0_17835926_7681.cpp:182:26: error: 'ev' was not declared in this scope
    t.link(c + eu[i], c + ev[i]);
                          ^