View Compilation Error

0_0_15274981_28253.cpp: In member function 'bool Tire<Type>::Find(Type*)':
0_0_15274981_28253.cpp:102:12: error: 'n' was not declared in this scope
  for(i=0;i<n;i++)
            ^
0_0_15274981_28253.cpp:104:26: error: expected primary-expression before '!=' token
   if(p->Node[str[i]-'a'])!=NULL)
                          ^