Di's Blog

Solutions and reasonings of Leetcode problems.

Leetcode

                            
                            LC 637 & LC 429 & LC 515
                        
                                Solution to LeetCode 637 Average of Levels in Binary Tree, LeetCode 429 N-ary Tree Level Order Traversal, and LeetCode 5
                            
                                2022-05-22
                            
                                    Binary Tree
                                
                            Queue
                        
                            BFS
                        
                            LC 102 & LC 107 & LC 199
                        
                                Solution to LeetCode 102 Binary Tree Level Order Traversal, LeetCode 107 Binary Tree Level Order Traversal II, and LeetC
                            
                                2022-05-21
                            
                                    Binary Tree
                                
                            Queue
                        
                            BFS
                        
                            LC 94 & LC 144 & LC 145 & LC 102 (with template)
                        
                                Solution to LeetCode 94 Binary Tree Inorder Traversal, LeetCode 144 Binary Tree Preorder Traversal, LeetCode 145 Binary 
                            
                                2022-05-20
                            
                                    Binary Tree
                                
                            Stack
                        
                            Template
                        
                            Recursive
                        
                            LC 239 & LC 347 & LC 973
                        
                                Solution to LeetCode 239 Sliding Window Maximum & LeetCode 347 Top K Frequent Elements & LeetCode 973 K Closest 
                            
                                2022-05-19
                            
                                    Queue
                                
                            Stack
                        
                            Queue
                        
                            Heap
                        
                            TopK
                        
                            LC 225 & LC 20 & LC 1047 & LC 150
                        
                                Solution to LeetCode 225 Implement Stack using Queues & LC 20 Valid Parentheses & LC 1047 Remove All Adjacent Du
                            
                                2022-05-18
                            
                                    Stack
                                
                            Stack
                        
                            Queue
                        
                            LC 232
                        
                                Solution to LeetCode 232 Implement Queue using Stacks.
LeetCode 232Implement Queue using Stacks (Easy) [link]
Python lis
                            
                                2022-05-17
                            
                                    Queue
                                
                            Stack
                        
                            Queue
                        
                            JZ 05 & JZ 58
                        
                                Solution to JZ 05 and JZ 58 II.
JZ 05(Easy) [link]
class Solution:
    def replaceSpace(self, s: str) -> str:
        cn
                            
                                2022-05-16
                            
                                    String
                                
                            Double Pointers
                        
                            String
                        
                            LC 28 & LC 459
                        
                                Solution to LeetCode 28 Implement strStr() and LeetCode 459 Repeated Substring Pattern.
LeetCode 28Implement strStr(). (
                            
                                2022-05-15
                            
                                    String
                                
                            Double Pointers
                        
                            String
                        
                            Knuth–Morris–Pratt
                        
                            LC 344 & LC 541 & LC 151
                        
                                Solution to LeetCode 344 Reverse String & LeetCode 541 Reverse String II & LeetCode 151 Reverse Words in a Strin
                            
                                2022-05-14
                            
                                    String
                                
                            Double Pointers
                        
                            String
                        
                            LC 15 & LC 18
                        
                                Solution to LeetCode 15 3Sum and LeetCode 18 4Sum.
LeetCode 153 Sum (Medium) [link]
HashTable is not the best method her
                            
                                2022-05-13
                            
                                    Double Pointers
                                
                            Double Pointers
                        
                            LC 1 & LC 454
                        
                                Solution to LeetCode 1 Two Sum & LeetCode 454 4 Sum II
LeetCode 1Two Sum (Easy) [link]

梦开始的地方。
This is where Dream 
                            
                                2022-05-12
                            
                                    HashTable
                                
                            HashTable
                        
                            LC 202
                        
                                Solution to LeetCode 202 Happy Number
LeetCode 202Happy Number (Easy) [link]
1] Hash Set. The calculated sum cannot be v
                            
                                2022-05-11
                            
                                    HashTable
                                
                            HashTable

            
7 / 18