View Compilation Error

0_0_6691780_10688.cpp: In function `void dfs()':
0_0_6691780_10688.cpp:54: error: `max' undeclared (first use this function)
0_0_6691780_10688.cpp:54: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6691780_10688.cpp: In function `int main()':
0_0_6691780_10688.cpp:73: error: `max' undeclared (first use this function)