View Compilation Error

56620_0_28035.cpp:5: error: `max' was not declared in this scope
56620_0_28035.cpp: In function `int main()':
56620_0_28035.cpp:17: error: `max' undeclared (first use this function)
56620_0_28035.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
56620_0_28035.cpp:19: error: `a' undeclared (first use this function)