View Compilation Error

0_0_18278958_13525.cpp: In function 'bool cmp(node, node)':
0_0_18278958_13525.cpp:17:14: error: 'struct node' has no member named 'x'
     return a.x<b.x;
              ^
0_0_18278958_13525.cpp:17:18: error: 'struct node' has no member named 'x'
     return a.x<b.x;
                  ^