|0100|Same Tree|[Go]({{< relref "/ChapterFour/0100~0199/0100.Same-Tree.md" >}})|Easy||||54.6%|

|0101|Symmetric Tree|[Go]({{< relref "/ChapterFour/0100~0199/0101.Symmetric-Tree.md" >}})|Easy| O(n)| O(1)||49.5%|

|0102|Binary Tree Level Order Traversal|[Go]({{< relref "/ChapterFour/0100~0199/0102.Binary-Tree-Level-Order-Traversal.md" >}})|Medium| O(n)| O(1)||58.4%|

|0103|Binary Tree Zigzag Level Order Traversal|[Go]({{< relref "/ChapterFour/0100~0199/0103.Binary-Tree-Zigzag-Level-Order-Traversal.md" >}})|Medium| O(n)| O(n)||51.4%|

|0104|Maximum Depth of Binary Tree|[Go]({{< relref "/ChapterFour/0100~0199/0104.Maximum-Depth-of-Binary-Tree.md" >}})|Easy||||69.4%|

|0107|Binary Tree Level Order Traversal II|[Go]({{< relref "/ChapterFour/0100~0199/0107.Binary-Tree-Level-Order-Traversal-II.md" >}})|Medium| O(n)| O(1)||56.5%|

|0111|Minimum Depth of Binary Tree|[Go]({{< relref "/ChapterFour/0100~0199/0111.Minimum-Depth-of-Binary-Tree.md" >}})|Easy| O(n)| O(1)||40.8%|

|0116|Populating Next Right Pointers in Each Node|[Go]({{< relref "/ChapterFour/0100~0199/0116.Populating-Next-Right-Pointers-in-Each-Node.md" >}})|Medium||||51.4%|

|0126|Word Ladder II|[Go]({{< relref "/ChapterFour/0100~0199/0126.Word-Ladder-II.md" >}})|Hard| O(n)| O(n^2)|❤️|25.2%|

|0127|Word Ladder|[Go]({{< relref "/ChapterFour/0100~0199/0127.Word-Ladder.md" >}})|Hard| O(n)| O(n)||33.1%|

|0130|Surrounded Regions|[Go]({{< relref "/ChapterFour/0100~0199/0130.Surrounded-Regions.md" >}})|Medium||||30.9%|

|0199|Binary Tree Right Side View|[Go]({{< relref "/ChapterFour/0100~0199/0199.Binary-Tree-Right-Side-View.md" >}})|Medium| O(n)| O(1)||57.5%|

|0200|Number of Islands|[Go]({{< relref "/ChapterFour/0200~0299/0200.Number-of-Islands.md" >}})|Medium| O(n^2)| O(n^2)||50.9%|

|0207|Course Schedule|[Go]({{< relref "/ChapterFour/0200~0299/0207.Course-Schedule.md" >}})|Medium| O(n^2)| O(n^2)||44.5%|

|0210|Course Schedule II|[Go]({{< relref "/ChapterFour/0200~0299/0210.Course-Schedule-II.md" >}})|Medium| O(n^2)| O(n^2)||44.1%|

|0226|Invert Binary Tree|[Go]({{< relref "/ChapterFour/0200~0299/0226.Invert-Binary-Tree.md" >}})|Easy||||68.6%|

|0279|Perfect Squares|[Go]({{< relref "/ChapterFour/0200~0299/0279.Perfect-Squares.md" >}})|Medium||||50.1%|

|0297|Serialize and Deserialize Binary Tree|[Go]({{< relref "/ChapterFour/0200~0299/0297.Serialize-and-Deserialize-Binary-Tree.md" >}})|Hard||||51.4%|

|0322|Coin Change|[Go]({{< relref "/ChapterFour/0300~0399/0322.Coin-Change.md" >}})|Medium||||38.5%|

|0329|Longest Increasing Path in a Matrix|[Go]({{< relref "/ChapterFour/0300~0399/0329.Longest-Increasing-Path-in-a-Matrix.md" >}})|Hard||||47.5%|

|0399|Evaluate Division|[Go]({{< relref "/ChapterFour/0300~0399/0399.Evaluate-Division.md" >}})|Medium||||55.4%|

|0404|Sum of Left Leaves|[Go]({{< relref "/ChapterFour/0400~0499/0404.Sum-of-Left-Leaves.md" >}})|Easy||||52.9%|

|0417|Pacific Atlantic Water Flow|[Go]({{< relref "/ChapterFour/0400~0499/0417.Pacific-Atlantic-Water-Flow.md" >}})|Medium||||45.6%|

|0429|N-ary Tree Level Order Traversal|[Go]({{< relref "/ChapterFour/0400~0499/0429.N-ary-Tree-Level-Order-Traversal.md" >}})|Medium||||67.9%|

|0433|Minimum Genetic Mutation|[Go]({{< relref "/ChapterFour/0400~0499/0433.Minimum-Genetic-Mutation.md" >}})|Medium||||44.2%|

|0463|Island Perimeter|[Go]({{< relref "/ChapterFour/0400~0499/0463.Island-Perimeter.md" >}})|Easy||||67.4%|

|0513|Find Bottom Left Tree Value|[Go]({{< relref "/ChapterFour/0500~0599/0513.Find-Bottom-Left-Tree-Value.md" >}})|Medium||||63.6%|

|0515|Find Largest Value in Each Tree Row|[Go]({{< relref "/ChapterFour/0500~0599/0515.Find-Largest-Value-in-Each-Tree-Row.md" >}})|Medium| O(n)| O(n)||63.1%|

|0529|Minesweeper|[Go]({{< relref "/ChapterFour/0500~0599/0529.Minesweeper.md" >}})|Medium||||62.6%|

|0530|Minimum Absolute Difference in BST|[Go]({{< relref "/ChapterFour/0500~0599/0530.Minimum-Absolute-Difference-in-BST.md" >}})|Easy||||55.5%|

|0542|01 Matrix|[Go]({{< relref "/ChapterFour/0500~0599/0542.01-Matrix.md" >}})|Medium| O(n)| O(1)||42.8%|

|0547|Number of Provinces|[Go]({{< relref "/ChapterFour/0500~0599/0547.Number-of-Provinces.md" >}})|Medium||||61.7%|

|0617|Merge Two Binary Trees|[Go]({{< relref "/ChapterFour/0600~0699/0617.Merge-Two-Binary-Trees.md" >}})|Easy||||76.2%|

|0623|Add One Row to Tree|[Go]({{< relref "/ChapterFour/0600~0699/0623.Add-One-Row-to-Tree.md" >}})|Medium||||53.3%|

|0637|Average of Levels in Binary Tree|[Go]({{< relref "/ChapterFour/0600~0699/0637.Average-of-Levels-in-Binary-Tree.md" >}})|Easy||||66.9%|

|0653|Two Sum IV - Input is a BST|[Go]({{< relref "/ChapterFour/0600~0699/0653.Two-Sum-IV-Input-is-a-BST.md" >}})|Easy||||56.8%|

|0662|Maximum Width of Binary Tree|[Go]({{< relref "/ChapterFour/0600~0699/0662.Maximum-Width-of-Binary-Tree.md" >}})|Medium||||39.4%|

|0684|Redundant Connection|[Go]({{< relref "/ChapterFour/0600~0699/0684.Redundant-Connection.md" >}})|Medium||||60.1%|

|0690|Employee Importance|[Go]({{< relref "/ChapterFour/0600~0699/0690.Employee-Importance.md" >}})|Easy||||60.6%|

|0695|Max Area of Island|[Go]({{< relref "/ChapterFour/0600~0699/0695.Max-Area-of-Island.md" >}})|Medium||||67.1%|

|0721|Accounts Merge|[Go]({{< relref "/ChapterFour/0700~0799/0721.Accounts-Merge.md" >}})|Medium||||53.4%|

|0733|Flood Fill|[Go]({{< relref "/ChapterFour/0700~0799/0733.Flood-Fill.md" >}})|Easy||||56.3%|

|0752|Open the Lock|[Go]({{< relref "/ChapterFour/0700~0799/0752.Open-the-Lock.md" >}})|Medium||||54.8%|

|0756|Pyramid Transition Matrix|[Go]({{< relref "/ChapterFour/0700~0799/0756.Pyramid-Transition-Matrix.md" >}})|Medium||||56.0%|

|0765|Couples Holding Hands|[Go]({{< relref "/ChapterFour/0700~0799/0765.Couples-Holding-Hands.md" >}})|Hard||||56.0%|

|0778|Swim in Rising Water|[Go]({{< relref "/ChapterFour/0700~0799/0778.Swim-in-Rising-Water.md" >}})|Hard||||57.8%|

|0783|Minimum Distance Between BST Nodes|[Go]({{< relref "/ChapterFour/0700~0799/0783.Minimum-Distance-Between-BST-Nodes.md" >}})|Easy||||54.9%|

|0785|Is Graph Bipartite?|[Go]({{< relref "/ChapterFour/0700~0799/0785.Is-Graph-Bipartite.md" >}})|Medium||||49.3%|

|0802|Find Eventual Safe States|[Go]({{< relref "/ChapterFour/0800~0899/0802.Find-Eventual-Safe-States.md" >}})|Medium||||50.8%|

|0815|Bus Routes|[Go]({{< relref "/ChapterFour/0800~0899/0815.Bus-Routes.md" >}})|Hard||||44.2%|

|0839|Similar String Groups|[Go]({{< relref "/ChapterFour/0800~0899/0839.Similar-String-Groups.md" >}})|Hard||||43.1%|

|0841|Keys and Rooms|[Go]({{< relref "/ChapterFour/0800~0899/0841.Keys-and-Rooms.md" >}})|Medium||||67.2%|

|0863|All Nodes Distance K in Binary Tree|[Go]({{< relref "/ChapterFour/0800~0899/0863.All-Nodes-Distance-K-in-Binary-Tree.md" >}})|Medium||||59.0%|

|0864|Shortest Path to Get All Keys|[Go]({{< relref "/ChapterFour/0800~0899/0864.Shortest-Path-to-Get-All-Keys.md" >}})|Hard||||43.2%|

|0909|Snakes and Ladders|[Go]({{< relref "/ChapterFour/0900~0999/0909.Snakes-and-Ladders.md" >}})|Medium||||39.3%|

|0924|Minimize Malware Spread|[Go]({{< relref "/ChapterFour/0900~0999/0924.Minimize-Malware-Spread.md" >}})|Hard||||41.9%|

|0928|Minimize Malware Spread II|[Go]({{< relref "/ChapterFour/0900~0999/0928.Minimize-Malware-Spread-II.md" >}})|Hard||||41.6%|

|0959|Regions Cut By Slashes|[Go]({{< relref "/ChapterFour/0900~0999/0959.Regions-Cut-By-Slashes.md" >}})|Medium||||68.0%|

|0987|Vertical Order Traversal of a Binary Tree|[Go]({{< relref "/ChapterFour/0900~0999/0987.Vertical-Order-Traversal-of-a-Binary-Tree.md" >}})|Hard||||39.3%|

|0993|Cousins in Binary Tree|[Go]({{< relref "/ChapterFour/0900~0999/0993.Cousins-in-Binary-Tree.md" >}})|Easy| O(n)| O(1)||52.4%|

|1020|Number of Enclaves|[Go]({{< relref "/ChapterFour/1000~1099/1020.Number-of-Enclaves.md" >}})|Medium||||60.2%|

|1091|Shortest Path in Binary Matrix|[Go]({{< relref "/ChapterFour/1000~1099/1091.Shortest-Path-in-Binary-Matrix.md" >}})|Medium||||40.8%|

|1123|Lowest Common Ancestor of Deepest Leaves|[Go]({{< relref "/ChapterFour/1100~1199/1123.Lowest-Common-Ancestor-of-Deepest-Leaves.md" >}})|Medium||||68.6%|

|1202|Smallest String With Swaps|[Go]({{< relref "/ChapterFour/1200~1299/1202.Smallest-String-With-Swaps.md" >}})|Medium||||49.8%|

|1203|Sort Items by Groups Respecting Dependencies|[Go]({{< relref "/ChapterFour/1200~1299/1203.Sort-Items-by-Groups-Respecting-Dependencies.md" >}})|Hard||||48.7%|

|1254|Number of Closed Islands|[Go]({{< relref "/ChapterFour/1200~1299/1254.Number-of-Closed-Islands.md" >}})|Medium||||62.4%|

|1302|Deepest Leaves Sum|[Go]({{< relref "/ChapterFour/1300~1399/1302.Deepest-Leaves-Sum.md" >}})|Medium||||85.4%|

|1319|Number of Operations to Make Network Connected|[Go]({{< relref "/ChapterFour/1300~1399/1319.Number-of-Operations-to-Make-Network-Connected.md" >}})|Medium||||55.8%|

|1631|Path With Minimum Effort|[Go]({{< relref "/ChapterFour/1600~1699/1631.Path-With-Minimum-Effort.md" >}})|Medium||||50.4%|