The Ninth Hunan Collegiate Programming Contest (2013) Problem I
ProblemIInterestingCalculatorThereisaninterestingcalculator.Ithas3rowsofbutton.Row1:button0,1,2,3,...,9.Pressingeachbuttonappendsthatdigittotheendofthedisplay.Row2:button+0,+1,+2,+3,...,+9.Pressingeac