- Added some more guest contributions by Laurent Rosenfeld.

3 files changed, 48 insertions, 0 deletions

diff --git a/challenge-173/laurent-rosenfeld/java/ch-2.java b/challenge-173/laurent-rosenfeld/java/ch-2.java
new file mode 100644
index 0000000000..53615c8fa6
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/java/ch-2.java
@@ -0,0 +1,13 @@
+import java.math.BigInteger;
+
+public class Sylvester {
+    public static void main(String[] args) {
+        BigInteger n = BigInteger.valueOf(2);
+        System.out.printf("%s\n", n);
+        BigInteger one = BigInteger.valueOf(1);
+        for (int i = 1; i <= 9; i++) {
+            n = (n.multiply(n.subtract(one))).add(one);
+            System.out.printf("%s\n", n);
+        }
+    }
+}
diff --git a/challenge-173/laurent-rosenfeld/rust/ch-1.rs b/challenge-173/laurent-rosenfeld/rust/ch-1.rs
new file mode 100644
index 0000000000..19526585cf
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/rust/ch-1.rs
@@ -0,0 +1,16 @@
+fn is_esthetic(num: i32) -> bool {
+    let n = num.to_string();
+    for i in 1..n.len() {
+        if n.as_bytes()[i] != n.as_bytes()[i-1] + 1 &&
+           n.as_bytes()[i-1] != n.as_bytes()[i] + 1 {
+            return false
+        }
+    }
+    return true
+}
+
+fn main() {
+    for test in [5456, 120, 121, 23456, 2346, 7654567, 765467] {
+        println!("{} -> {}", test, if is_esthetic (test) { " is esthetic"} else { " is not esthetic"});
+    }
+}
diff --git a/challenge-173/laurent-rosenfeld/scala/ch-1.scala b/challenge-173/laurent-rosenfeld/scala/ch-1.scala
new file mode 100644
index 0000000000..694586d3c4
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/scala/ch-1.scala
@@ -0,0 +1,19 @@
+object esthetic extends App {
+  def is_esthetic(num: Int): Boolean = {
+    val digits = num.toString.split("")
+    for (i <- 1 to (digits.size) - 1) {
+      if ((digits(i).toInt - digits(i-1).toInt).abs != 1) {
+        return false
+      }
+    }
+    return true
+  }
+  val tests = List(5456, 120, 121, 23456, 2346, 7654567, 765467)
+  for (test <- tests) {
+    if (is_esthetic(test)) {
+      println(s"$test is esthetic")
+    } else {
+      println(s"$test is not esthetic")
+    }
+  }
+}