03-homework1.md: Use Scala syntax highlighting

week1/03-homework1.md

@@ -35,7 +35,9 @@ Do this exercise by implementing the `pascal` function in
 `0` and returns the number at that spot in the triangle. For example,
 `pascal(0,2)=1`, `pascal(1,2)=2` and `pascal(1,3)=3`.
 
-    def pascal(c: Int, r: Int): Int
+```scala
+def pascal(c: Int, r: Int): Int
+```
 
 # Exercise 2: Parentheses Balancing
 
@@ -59,7 +61,9 @@ contains the same number of opening and closing parentheses.
 Do this exercise by implementing the `balance` function in
 `Main.scala`. Its signature is as follows:
 
-    def balance(chars: List[Char]): Boolean
+```scala
+def balance(chars: List[Char]): Boolean
+```
 
 There are three methods on `List[Char]` that are useful for this
 exercise:
@@ -85,7 +89,9 @@ Do this exercise by implementing the `countChange` function in
 `Main.scala`. This function takes an amount to change, and a list of
 unique denominations for the coins. Its signature is as follows:
 
-    def countChange(money: Int, coins: List[Int]): Int
+```scala
+def countChange(money: Int, coins: List[Int]): Int
+```
 
 Once again, you can make use of functions `isEmpty`, `head` and `tail`
 on the list of integers `coins`.