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VladD's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 11:22:15
public class SumItUp { public int sum(int N) { if(sumDigits(N)<10) return sumDigits(N); else return sum(sumDigits(N)); } public int sumDigits(int p) { int n=0; while(p>0) { n+=p%10; p/=10; } return n; } }