View Compilation Error

0_0_2138949_4877.cpp: In function `void dfs(int*)':
0_0_2138949_4877.cpp:15: error: `max' undeclared (first use this function)
0_0_2138949_4877.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2138949_4877.cpp: In function `int main()':
0_0_2138949_4877.cpp:50: error: `max' undeclared (first use this function)