View Compilation Error

0_0_26233001_26940.cpp: In function 'bool cmp(node, node)':
0_0_26233001_26940.cpp:16:12: error: 'struct node' has no member named 'r'
   return a.r<b.r;
            ^
0_0_26233001_26940.cpp:16:16: error: 'struct node' has no member named 'r'
   return a.r<b.r;
                ^