View Compilation Error

335635_0_24260.cpp:10: error: ISO C++ forbids declaration of `operator<' with no type
335635_0_24260.cpp: In function `int main()':
335635_0_24260.cpp:32: error: `max' undeclared (first use this function)
335635_0_24260.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
335635_0_24260.cpp: In function `void bfs()':
335635_0_24260.cpp:70: error: `max' undeclared (first use this function)