View Compilation Error

0_0_6344987_24822.cpp: In function `void bfs(point)':
0_0_6344987_24822.cpp:33: error: `max' undeclared (first use this function)
0_0_6344987_24822.cpp:33: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6344987_24822.cpp: In function `int main()':
0_0_6344987_24822.cpp:53: error: `max' undeclared (first use this function)