View Compilation Error

0_0_2138962_27078.cpp: In function `void dfs(int*)':
0_0_2138962_27078.cpp:17: error: `max' undeclared (first use this function)
0_0_2138962_27078.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2138962_27078.cpp:31: error: cannot convert `long long int*' to `int*' for argument `1' to `void dfs(int*)'
0_0_2138962_27078.cpp: In function `int main()':
0_0_2138962_27078.cpp:52: error: `max' undeclared (first use this function)