diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 3af29c7..49f8fe8 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -52,4 +52,6 @@ mod p107_binary_tree_level_order_traversal_ii;
 mod p103_binary_tree_zigzag_level_order_traversal;
 mod p105_construct_binary_tree_from_preorder_and_inorder_traversal;
 mod p106_construct_binary_tree_from_inorder_and_postorder_traversal;
-mod p235_lowest_common_ancestor_of_a_binary_search_tree;
\ No newline at end of file
+mod p235_lowest_common_ancestor_of_a_binary_search_tree;
+mod p2583_kth_largest_sum_in_a_binary_tree;
+mod p2476_closest_nodes_queries_in_a_binary_search_tree;
\ No newline at end of file
diff --git a/src/problem/p2476_closest_nodes_queries_in_a_binary_search_tree.rs b/src/problem/p2476_closest_nodes_queries_in_a_binary_search_tree.rs
new file mode 100644
index 0000000..5bc72b9
--- /dev/null
+++ b/src/problem/p2476_closest_nodes_queries_in_a_binary_search_tree.rs
@@ -0,0 +1,84 @@
+/**
+ * [2476] Closest Nodes Queries in a Binary Search Tree
+ */
+pub struct Solution {}
+
+use surf::url::UrlQuery;
+
+use crate::util::tree::{TreeNode, to_tree};
+
+// submission codes start here
+
+// Definition for a binary tree node.
+// #[derive(Debug, PartialEq, Eq)]
+// pub struct TreeNode {
+//   pub val: i32,
+//   pub left: Option<Rc<RefCell<TreeNode>>>,
+//   pub right: Option<Rc<RefCell<TreeNode>>>,
+// }
+//
+// impl TreeNode {
+//   #[inline]
+//   pub fn new(val: i32) -> Self {
+//     TreeNode {
+//       val,
+//       left: None,
+//       right: None
+//     }
+//   }
+// }
+use std::rc::Rc;
+use std::cell::RefCell;
+impl Solution {
+    pub fn closest_nodes(root: Option<Rc<RefCell<TreeNode>>>, queries: Vec<i32>) -> Vec<Vec<i32>> {
+        let mut array = Vec::new();
+        let mut stack = Vec::new();
+        let mut root = root;
+
+        while root.is_some() || !stack.is_empty() {
+            while let Some(r) = root {
+                stack.push(Rc::clone(&r));
+                root = r.borrow().left.clone();
+            }
+
+            root = stack.pop();
+            if let Some(r) = root {
+                array.push(r.borrow().val);
+                root = r.borrow().right.clone();
+            }
+        }
+
+        let mut result = Vec::with_capacity(queries.len());
+        for query in queries {
+            let pos = array.binary_search(&query);
+
+            match pos {
+                Ok(pos) => {
+                    result.push(vec![array[pos], array[pos]]);
+                },
+                Err(pos) => {
+                    if pos == 0 {
+                        result.push(vec![-1, array[pos]]);
+                    } else if pos == array.len() {
+                        result.push(vec![array[pos - 1], -1])
+                    } else {
+                        result.push(vec![array[pos - 1], array[pos]]);
+                    }
+                }
+            }
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2476() {
+    }
+}
diff --git a/src/problem/p2583_kth_largest_sum_in_a_binary_tree.rs b/src/problem/p2583_kth_largest_sum_in_a_binary_tree.rs
new file mode 100644
index 0000000..53aa03b
--- /dev/null
+++ b/src/problem/p2583_kth_largest_sum_in_a_binary_tree.rs
@@ -0,0 +1,80 @@
+/**
+ * [2583] Kth Largest Sum in a Binary Tree
+ */
+pub struct Solution {}
+
+use crate::util::tree::{TreeNode, to_tree};
+
+// submission codes start here
+
+// Definition for a binary tree node.
+// #[derive(Debug, PartialEq, Eq)]
+// pub struct TreeNode {
+//   pub val: i32,
+//   pub left: Option<Rc<RefCell<TreeNode>>>,
+//   pub right: Option<Rc<RefCell<TreeNode>>>,
+// }
+//
+// impl TreeNode {
+//   #[inline]
+//   pub fn new(val: i32) -> Self {
+//     TreeNode {
+//       val,
+//       left: None,
+//       right: None
+//     }
+//   }
+// }
+use std::rc::Rc;
+use std::cell::RefCell;
+impl Solution {
+    pub fn kth_largest_level_sum(root: Option<Rc<RefCell<TreeNode>>>, k: i32) -> i64 {
+        let root = if let Some(r) = root {
+            r
+        } else {
+            return -1;
+        };
+        let k = k as usize;
+        
+        let mut levels = Vec::new();
+        let mut level = vec![root];
+
+        while !level.is_empty() {
+            let mut new_level = Vec::new();
+            let mut sum = 0;
+
+            for node in level {
+                sum += node.borrow().val as i64;
+                
+                if let Some(left) = &node.borrow().left {
+                    new_level.push(Rc::clone(left));
+                }
+
+                if let Some(right) = &node.borrow().right {
+                    new_level.push(Rc::clone(right));
+                }
+            }
+
+            levels.push(sum);
+            level = new_level;
+        }
+
+        if levels.len() < k {
+            return -1;
+        }
+        levels.sort_unstable();
+
+        levels[levels.len() - k]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2583() {
+    }
+}