View Compilation Error

0_0_28876711_30678.cpp: In function 'int nxt(int)':
0_0_28876711_30678.cpp:41:34: error: 'd' was not declared in this scope
  while(t[p].son[0])p=t[p].son[0],d
                                  ^
0_0_28876711_30678.cpp:41:34: error: expected '}' at end of input