View Compilation Error

0_0_6405623_17904.cpp: In function `void initial()':
0_0_6405623_17904.cpp:9: error: `max' undeclared (first use this function)
0_0_6405623_17904.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6405623_17904.cpp: In function `void dfs1(int)':
0_0_6405623_17904.cpp:21: error: `max' undeclared (first use this function)
0_0_6405623_17904.cpp: In function `void dfs2(int)':
0_0_6405623_17904.cpp:47: error: `max' undeclared (first use this function)
0_0_6405623_17904.cpp: In function `int main()':
0_0_6405623_17904.cpp:88: error: `max' undeclared (first use this function)