View Compilation Error

0_0_34335072_11218.cpp: In member function 'void Tree::pd(int, int, int)':
0_0_34335072_11218.cpp:27:50: error: 'right_laz' was not declared in this scope
             rc[node*2]=(rc[node*2]*len_laz[node]+right_laz[node])%mod;
                                                  ^