View Compilation Error

0_0_1111334_30893.cpp: In function `int main()':
0_0_1111334_30893.cpp:22: error: `max' undeclared (first use this function)
0_0_1111334_30893.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1111334_30893.cpp: In function `void dfs(int, int, int, int)':
0_0_1111334_30893.cpp:34: error: `max' undeclared (first use this function)