View Compilation Error

56621_0_17078.cpp:5: error: `max' was not declared in this scope
56621_0_17078.cpp: In function `int main()':
56621_0_17078.cpp:19: error: `a' undeclared (first use this function)
56621_0_17078.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)