docs: add source code from book as starting point to modify

1 files changed, 38 insertions, 0 deletions

diff --git a/src/03/07/README.md b/src/03/07/README.md
index 8e85bde..20b320e 100644
--- a/src/03/07/README.md
+++ b/src/03/07/README.md
@@ -1,2 +1,40 @@
 Implement the `remove(u)` method, that removes the node `u` from a
 `MeldableHeap`. This method should run in `O(log n)` expected time.
+
+
+```java
+class MeldableHeap {
+  Node<T> merge(Node<T> h1, Node<T> h2) {
+    if (h1 == nil) return h2;
+    if (h2 == nil) return h1;
+    if (compare(h2.x, h1.x) < 0) return merge(h2, h1);
+
+    if (rand.nextBoolean()) {
+      h1.left = merge(h1.left, h2);
+      h1.left.parent = h1;
+    } else {
+      h1.right = merge(h1.right, h2);
+      h1.right.parent = h1;
+    }
+    return h1;
+  }
+
+  boolean add(T x) {
+    Node<T> u = newNode();
+    u.x = x;
+    r = merge(u, r);
+    r.parent = nil;
+    n++;
+    return true;
+  }
+
+  T remove() {
+    T x = r.x;
+    r = merge(r.left, r.right);
+    if (r != nil) r.parent = nil;
+    n--;
+    return x;
+  }
+}
+```
+[Source](https://www.aupress.ca/app/uploads/120226_99Z_Morin_2013-Open_Data_Structures.pdf)