View Compilation Error

0_0_6897799_5590.cpp: In member function `bool node::operator<(const node&) const':
0_0_6897799_5590.cpp:17: error: `p' undeclared (first use this function)
0_0_6897799_5590.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6897799_5590.cpp:17: error: 'const struct node' has no member named 'p'