![]() ![]() Remove Zero Sum Consecutive Nodes from Linked List 1170. Number of Valid Words for Each Puzzle 1177. Maximum Subarray Sum with One Deletion 1185. Reverse Substrings Between Each Pair of Parentheses 1189. Sort Items by Groups Respecting Dependencies 1202. Remove All Adjacent Duplicates in String II 1208. Minimum Moves to Reach Target with Rotations 1209. Minimum Cost to Move Chips to The Same Position 1210. Longest Arithmetic Subsequence of Given Difference 1217. Airplane Seat Assignment Probability 1224. ![]() Remove Sub-Folders from the Filesystem 1232. Replace the Substring for Balanced String 1233. Find Positive Integer Solution for a Given Equation 1235. Circular Permutation in Binary Representation 1237. Maximum Length of a Concatenated String with Unique Characters 1238. Tiling a Rectangle with the Fewest Squares 1239. Minimum Swaps to Make Strings Equal 1240. ![]() Minimum Remove to Make Valid Parentheses 1248. Maximum Score Words Formed by Letters 1254. Find Elements in a Contaminated Binary Tree 1260. Minimum Moves to Move a Box to Their Target Location 1262. Number of Ways to Stay in the Same Place After Some Steps 1268. Number of Burgers with No Waste of Ingredients 1275. Count Square Submatrices with All Ones 1276. Subtract the Product and Sum of Digits of an Integer 1278. Group the People Given the Group Size They Belong To 1281. Find the Smallest Divisor Given a Threshold 1282. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix 1283. Element Appearing More Than 25% In Sorted Array 1286. Convert Binary Number in a Linked List to Integer 1289. Maximum Side Length of a Square with Sum Less than or Equal to Threshold 1291. Shortest Path in a Grid with Obstacles Elimination 1292. Find Numbers with Even Number of Digits 1293. Divide Array in Sets of K Consecutive Numbers 1295. Maximum Number of Occurrences of a Substring 1296. Maximum Candies You Can Get from Boxes 1297. Replace Elements with Greatest Element on Right Side 1298. Sum of Mutated Array Closest to Target 1299. Find N Unique Integers Sum up to Zero 1302. All Elements in Two Binary Search Trees 1304. Decrypt String from Alphabet to Integer Mapping 1307. Minimum Insertion Steps to Make a String Palindrome 1311. Sum of Nodes with Even-Valued Grandparent 1314. Convert Integer to the Sum of Two No-Zero Integers 1316. Minimum Flips to Make a OR b Equal to c 1317. Number of Operations to Make Network Connected 1318. Minimum Distance to Type a Word Using Two Fingers 1319. ![]() Your serialize and deserialize algorithms should be stateless.1320. Note: Do not use class member/global/static variables to store states. You do not necessarily need to follow this format, so please be creative and come up with different approaches yourself. You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure.įor example, you may serialize the following tree 1Īs "", just the same as how LeetCode OJ serializes a binary tree. There is no restriction on how your serialization/deserialization algorithm should work. Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another computer environment.ĭesign an algorithm to serialize and deserialize a binary tree. Number of Connected Components in an Undirected Graph Verify Preorder Serialization of a Binary Tree Smallest Rectangle Enclosing Black Pixels Read N Characters Given Read4 II - Call multiple times Longest Substring with At Most K Distinct Charactersīest Time to Buy and Sell Stock with Cooldown Longest Substring with At Most Two Distinct Characters ![]()
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