Same Tree

Author: TonyKim9401

same-tree/TonyKim9401.java

@@ -0,0 +1,17 @@
+// TC: O(n)
+// retreive all given nodes
+// SC: O(1)
+// doesn't require additional space
+class Solution {
+    public boolean isSameTree(TreeNode p, TreeNode q) {
+        if (p == null || q == null) {
+            if (p == null && q == null) return true;
+            return false;
+        }
+
+        if (p.val != q.val) return false;
+
+        return isSameTree(p.left, q.left) &&
+                isSameTree(p.right, q.right);
+    }
+}