View Compilation Error

82940_0_21548.cpp: In function `void dfs(int, int, int&)':
82940_0_21548.cpp:11: error: `max' undeclared (first use this function)
82940_0_21548.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
82940_0_21548.cpp: In function `int main()':
82940_0_21548.cpp:51: error: `max' undeclared (first use this function)