View Compilation Error

538026_0_0_24464.cpp: In function `void dfs(int, int)':
538026_0_0_24464.cpp:15: error: `max' undeclared (first use this function)
538026_0_0_24464.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
538026_0_0_24464.cpp: In function `int main()':
538026_0_0_24464.cpp:55: error: `max' undeclared (first use this function)