Initial data commit

Task/Josephus-problem/Java/josephus-problem-2.java

@@ -0,0 +1,37 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class Josephus {
+
+	public static void main(String[] args) {
+		execute(5, 1);
+		execute(41, 2);
+		execute(23482, 3342, 3);
+	}
+
+	public static int[][] execute(int n, int k) {
+		return execute(n, k, 1);
+	}
+
+	public static int[][] execute(int n, int k, int s) {
+		List<Integer> ps = new ArrayList<Integer>(n);
+		for (int i=0; i<n; i+=1) ps.add(i);
+		List<Integer> ks = new ArrayList<Integer>(n-s);
+		for (int i=k; ps.size()>s; i=(i+k)%ps.size()) ks.add(ps.remove(i));
+		System.out.printf("Josephus(%d,%d,%d) -> %s / %s\n", n, k, s, toString(ps), toString(ks));
+		return new int[][] {
+			ps.stream().mapToInt(Integer::intValue).toArray(),
+			ks.stream().mapToInt(Integer::intValue).toArray()
+		};
+	}
+	
+	private static String toString(List <Integer> ls) {
+		String dot = "";
+		if (ls.size() >= 45) {
+			dot = ", ...";
+			ls = ls.subList(0, 45);
+		}
+		String s = ls.toString();
+		return s.substring(1, s.length()-1) + dot;
+	}
+}