View Compilation Error

0_0_6859421_24442.cpp: In function `void DFS(int, int, int, int)':
0_0_6859421_24442.cpp:18: error: `max' undeclared (first use this function)
0_0_6859421_24442.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6859421_24442.cpp: In function `int main()':
0_0_6859421_24442.cpp:33: error: `max' undeclared (first use this function)