View Compilation Error

0_0_4019079_29745.cpp: In function `void Merge(int, int)':
0_0_4019079_29745.cpp:20: error: `max' undeclared (first use this function)
0_0_4019079_29745.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4019079_29745.cpp: In function `int main()':
0_0_4019079_29745.cpp:36: error: `max' undeclared (first use this function)