View Compilation Error

0_0_11391684_436.cpp:13: error: ISO C++ forbids declaration of `b' with no type
0_0_11391684_436.cpp: In member function `bool Item::operator<(const int&) const':
0_0_11391684_436.cpp:14: error: `k' is not a type
0_0_11391684_436.cpp:14: error: request for member of non-aggregate type before ';' token
0_0_11391684_436.cpp: In function `int main()':
0_0_11391684_436.cpp:19: error: `N' undeclared (first use this function)
0_0_11391684_436.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)