0_0_18169332_6754.cpp: In function 'bool cmp(node, node)': 0_0_18169332_6754.cpp:22:7: error: 'A' was not declared in this scope if(A.x!=B.x) ^ 0_0_18169332_6754.cpp:22:12: error: 'B' was not declared in this scope if(A.x!=B.x) ^