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digitalis's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 11:25:19
public class SumItUp { /** * @param args */ public static int sum(int N) { int rez=0; int flag=0; while (N>0) { rez+=N%10; N/=10; } if (rez<10) flag=1; int pom; while (flag==0) { pom=rez; rez=0; while(pom>0) { rez+=pom%10; pom/=10; } if(pom<10) flag=1; } return rez; } }