1 files changed, 39 insertions, 0 deletions
diff --git a/challenge-236/deadmarshal/java/Ch1.java b/challenge-236/deadmarshal/java/Ch1.java
new file mode 100644
index 0000000000..013b6ac91c
--- /dev/null
+++ b/challenge-236/deadmarshal/java/Ch1.java
@@ -0,0 +1,39 @@
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class Ch1 {
+  public static void main(String[] args) {
+    ArrayList<Integer> arr1 = new ArrayList<>(List.of(5,5,5,10,20));
+    ArrayList<Integer> arr2 = new ArrayList<>(List.of(5,5,10,10,20));
+    ArrayList<Integer> arr3 = new ArrayList<>(List.of(5,5,5,20));
+    System.out.println(exact_change(arr1));
+    System.out.println(exact_change(arr2));
+    System.out.println(exact_change(arr3));
+  }
+
+  private static boolean exact_change(List<Integer> list) {
+    HashMap<Integer,Integer> m = new HashMap<Integer,Integer>();
+    for(var e : list)
+    {
+      if(e == 10)
+      {
+        m.replace(5, m.get(5) - 1);
+        if(m.get(5) == 0) return false;
+      }
+      else if(e == 20)
+      {
+        if(m.getOrDefault(5,0) != 0 &&
+          m.getOrDefault(10,0) != 0)
+        {
+          m.replace(5,m.get(5)-1);
+          m.replace(10,m.get(10)-1);
+        }
+        else if(m.get(5) > 2) m.replace(5,m.get(5)-3);
+        else return false;
+      }
+      m.put(e,m.getOrDefault(e,0)+1);
+    }
+    return true;
+  }
+}