Add solutions to a_billeterie and b_jeu_des_batonnets in Groovy

pre-contest/a_billeterie/solutions/a_billeterie.groovy

@@ -0,0 +1,11 @@
+def reader = System.in.newReader()
+
+def prix2nde = reader.readLine() as int
+def prix1ere = reader.readLine() as int
+
+def nbBillets2nde = reader.readLine() as int
+def nbBillets1ere = reader.readLine() as int
+
+def prixTotal = prix2nde * nbBillets2nde + prix1ere * nbBillets1ere
+println prixTotal
+

pre-contest/b_jeu_des_batonnets/solutions/b_jeu_des_batonnets.groovy

@@ -0,0 +1,16 @@
+def reader = System.in.newReader()
+
+def (nb, b) = reader.readLine().split(' ').collect { it as Integer }
+def j = reader.readLine() as Integer
+
+int div(int a, int b) {
+    Math.floor(a / b)
+}
+
+if ((j==0 && (div(nb-b, b+1) - div(nb-1, b+1) < 0 || (nb-b) % (b+1) == 0))
+    || (j==1 && (div(nb-b, b+1) - div(nb-1, b+1) == 0 && (nb-b) % (b+1) != 0))) {
+    println "OUI"
+}
+else {
+    println "NON"
+}