View Compilation Error

0_0_30022747_10468.cpp: In function 'bool operator<(node, node)':
0_0_30022747_10468.cpp:9:52: error: 'be' was not declared in this scope
         if (bel[a.l] != bel[b.l])return bel[a.l] < be[b.l];
                                                    ^