View Compilation Error

0_0_4414568_18064.cpp: In function `void update(int, int)':
0_0_4414568_18064.cpp:16: error: `MAX' undeclared (first use this function)
0_0_4414568_18064.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4414568_18064.cpp: In function `int main()':
0_0_4414568_18064.cpp:41: error: `add' undeclared (first use this function)