using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(PinesCalculator.Calculate("XXXXX")==10+10+10 +10+10+10 +10+10+10 +10+10+10 +10+10+10); 

        Console.WriteLine(PinesCalculator.Calculate("1/2/3/4/5/6/")==(19+18+17+16+15+14)); 

        Console.WriteLine(PinesCalculator.Calculate("134678")==(1+3+4+6+7+8)); 

        Console.WriteLine(PinesCalculator.Calculate("X34X12X")==(10+3+4 +3+4  +10+1+2 +1+2 +10)); 

        Console.WriteLine(PinesCalculator.Calculate("X3/5/")==(10+17+15 +17 +15)); 

    }

}

​

public static class PinesCalculator{

    public static int Calculate(string scores){

​

        int retVal=0, currentScoreVal=0, previousScore=0, previousScore2=0;

        int strike=0, strikeVal=0, scoreIndex=0;

        for(int i=0;i<scores.Length;i++){

            char currentScore=scores[i];

            previousScore2=previousScore;

            previousScore=currentScoreVal;

            strikeVal=0;

            if(currentScore=='X'){ // strike

                currentScoreVal=10;

                strike=2;

                scoreIndex=0;

            }

            else if (currentScore=='/'){ // spare

                currentScoreVal=(10+(10-2*previousScore));

                scoreIndex=0;

                if(strike>-1){

                    strikeVal=currentScoreVal+previousScore;

                    strike--;

                }               

            }

            else if (currentScore=='-'){

            }

            else { // normal score

                int normalScore=int.Parse(currentScore.ToString());

                currentScoreVal=normalScore;

                if(scoreIndex>0){

                    if(strike>-1){

                        strikeVal=currentScoreVal+previousScore;

                        strike--;

                    }               

                    scoreIndex=0;

                }

                scoreIndex++;

            }

            retVal+=currentScoreVal+strikeVal;

​

        }

        return retVal;

    }

}