View Compilation Error

491214_0_0_28112.cpp: In function `bool run()':
491214_0_0_28112.cpp:18: error: `max' undeclared (first use this function)
491214_0_0_28112.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
491214_0_0_28112.cpp:21: error: `a' undeclared (first use this function)