Link to the previous title , Link to the following question

 

Original title (50 topic ) link <https://leetcode-cn.com/problemset/2018-50/>

 

catalog

 

  # title answer Pass rate difficulty
  104
Maximum depth of binary tree <https://leetcode-cn.com/problems/maximum-depth-of-binary-tree>    
  64.1% simple
  344
Reverse string <https://leetcode-cn.com/problems/reverse-string>    
  62.5% simple
  292
Nim game <https://leetcode-cn.com/problems/nim-game>    
  61.1% simple
  557
Invert words in strings III <https://leetcode-cn.com/problems/reverse-words-in-a-string-iii>
    
  60.6% simple
  237
Delete nodes in linked list <https://leetcode-cn.com/problems/delete-node-in-a-linked-list>    
  57.3% simple
  136
Numbers that appear only once <https://leetcode-cn.com/problems/single-number>    
  52.6% simple
  206
Reverse linked list <https://leetcode-cn.com/problems/reverse-linked-list>    
  52.5% simple
  169
Seeking mode <https://leetcode-cn.com/problems/majority-element>    
  51.5% simple
  9
Palindrome number <https://leetcode-cn.com/problems/palindrome-number>    
  51.5% simple
  235
The nearest common ancestor of binary search tree
<https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-search-tree>
    
  50.8% simple
  21
Merge two ordered linked lists <https://leetcode-cn.com/problems/merge-two-sorted-lists>    
  48.9% simple
  122
The best time to buy and sell stocks II
<https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-ii>    
  48.2% simple
  155
Minimum stack <https://leetcode-cn.com/problems/min-stack>    
  44.8% simple
  121
The best time to buy and sell stocks <https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock>
    
  43.4% simple
  231
2 Power of <https://leetcode-cn.com/problems/power-of-two>    
  41.1% simple
  217
There are duplicate elements <https://leetcode-cn.com/problems/contains-duplicate>    
  40.9% simple
  70
climb stairs <https://leetcode-cn.com/problems/climbing-stairs>    
  40.7% simple
  26
Remove duplicate items from sorted array
<https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array>    
  39.5% simple
  88
Merge two ordered arrays <https://leetcode-cn.com/problems/merge-sorted-array>    
  38.4% simple
  53
Maximal sum of subsequences <https://leetcode-cn.com/problems/maximum-subarray>    
  37.9% simple
  20
Valid parentheses <https://leetcode-cn.com/problems/valid-parentheses>    
  32.4% simple
  141
Circular list <https://leetcode-cn.com/problems/linked-list-cycle>    
  29.7% simple
  160
Intersecting linked list <https://leetcode-cn.com/problems/intersection-of-two-linked-lists>    
  29.4% simple
  14
Longest Common Prefix <https://leetcode-cn.com/problems/longest-common-prefix>    
  28.9% simple
  7
Reverse integer <https://leetcode-cn.com/problems/reverse-integer>    
  28.6% simple
  78
subset <https://leetcode-cn.com/problems/subsets>    
  66.6% secondary
  59
Spiral matrix II <https://leetcode-cn.com/problems/spiral-matrix-ii>    
  66.2% secondary
  46
Permutation <https://leetcode-cn.com/problems/permutations>    
  60.3% secondary
  230
In binary search tree K Small elements <https://leetcode-cn.com/problems/kth-smallest-element-in-a-bst>
    
  56.7% secondary
  238
The product of an array other than itself <https://leetcode-cn.com/problems/product-of-array-except-self>    
  54.1% secondary
  89
Gray coding <https://leetcode-cn.com/problems/gray-code>    
  53.9% secondary
  148
Sort linked list <https://leetcode-cn.com/problems/sort-list>    
  51.2% secondary
  215
In array K Maximum elements <https://leetcode-cn.com/problems/kth-largest-element-in-an-array>
    
  50.3% secondary
  62
Different paths <https://leetcode-cn.com/problems/unique-paths>    
  48.8% secondary
  11
Container for the most water <https://leetcode-cn.com/problems/container-with-most-water>    
  41.2% secondary
  236
The nearest common ancestor of binary trees
<https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree>    
  37.7% secondary
  16
The sum of the nearest three numbers <https://leetcode-cn.com/problems/3sum-closest>    
  34.5% secondary
  61
Rotating list <https://leetcode-cn.com/problems/rotate-list>    
  33.4% secondary
  43
String multiplication <https://leetcode-cn.com/problems/multiply-strings>    
  33.1% secondary
  33
Search rotation sort array <https://leetcode-cn.com/problems/search-in-rotated-sorted-array>    
  32.1% secondary
  54
Spiral matrix <https://leetcode-cn.com/problems/spiral-matrix>    
  30.2% secondary
  2
Add two numbers together <https://leetcode-cn.com/problems/add-two-numbers>    
  29.0% secondary
  142
Circular list II <https://leetcode-cn.com/problems/linked-list-cycle-ii>    
  26.7% secondary
  5
Longest Palindromic Substring <https://leetcode-cn.com/problems/longest-palindromic-substring>    
  22.5% secondary
  15
Sum of three numbers <https://leetcode-cn.com/problems/3sum>    
  15.7% secondary
  8
String to integer (atoi) <https://leetcode-cn.com/problems/string-to-integer-atoi>    
  15.3% secondary
  23
merge K Sorted list <https://leetcode-cn.com/problems/merge-k-sorted-lists>    
  38.6% difficulty
  146
LRU Caching mechanism <https://leetcode-cn.com/problems/lru-cache>    
  32.5% difficulty
  124
Maximum path sum in binary tree <https://leetcode-cn.com/problems/binary-tree-maximum-path-sum>    
  30.5% difficulty
  4
Median of two sorted arrays <https://leetcode-cn.com/problems/median-of-two-sorted-arrays>    
  30.3% difficulty
Sorted from easy to difficult  

 

The following will be updated in succession , Try to make the layout ideas perfect , I hope you can also gain something , Exchange and study together ~~~

 

catalog

catalog
<https://blog.csdn.net/weixin_41793113/article/details/82721102#%E7%9B%AE%E5%BD%95>

leetcode 104. Maximum depth of binary tree (Maximum Depth of Binary Tree)
<https://blog.csdn.net/weixin_41793113/article/details/82721195>

leetcode 344. Reverse string (Reverse String)
<https://blog.csdn.net/weixin_41793113/article/details/82721285>

leetcode 292. Nim game (Nim Game)
<https://blog.csdn.net/weixin_41793113/article/details/82721852>

leetcode 557. Invert words in strings III(Reverse Words in a String III)
<https://blog.csdn.net/weixin_41793113/article/details/82722366>

leetcode 237. Delete nodes in linked list (Delete Node in a Linked List)
<https://blog.csdn.net/weixin_41793113/article/details/82722400>

leetcode 136. Numbers that appear only once (Single Number)
<https://blog.csdn.net/weixin_41793113/article/details/82722469>

leetcode 206. Reverse linked list (Reverse Linked List) java beat 100%
<https://blog.csdn.net/weixin_41793113/article/details/82528926>

leetcode 169. Seeking mode (Majority Element)
<https://blog.csdn.net/weixin_41793113/article/details/82722636>

leetcode 9. Palindrome number (Palindrome Number)
<https://blog.csdn.net/weixin_41793113/article/details/82722871>

leetcode 235. The nearest common ancestor of binary search tree (Lowest Common Ancestor of a Binary Search Tree)
<https://blog.csdn.net/weixin_41793113/article/details/82723836>

leetcode 21. Merge two ordered linked lists (Merge Two Sorted Lists)
<https://blog.csdn.net/weixin_41793113/article/details/82724043>

leetcode 122. The best time to buy and sell stocks II(Best Time to Buy and Sell Stock II) beat 100%
<https://blog.csdn.net/weixin_41793113/article/details/82747453>

leetcode 155. Minimum stack (Min Stack)
<https://blog.csdn.net/weixin_41793113/article/details/82723767>

leetcode 121. The best time to buy and sell stocks (Best Time to Buy and Sell Stock)
<https://blog.csdn.net/weixin_41793113/article/details/82748503>

leetcode 231. 2 Power of (Power of Two)
<https://blog.csdn.net/weixin_41793113/article/details/82761554>

leetcode 217. There are duplicate elements (Contains Duplicate)
<https://blog.csdn.net/weixin_41793113/article/details/82761735>

leetcode 70. climb stairs (Climbing Stairs)
<https://blog.csdn.net/weixin_41793113/article/details/82761835>

leetcode 26. Remove duplicate items from sorted array (Remove Duplicates from Sorted Array)
<https://blog.csdn.net/weixin_41793113/article/details/82761976>

leetcode 88. Merge two ordered arrays (Merge Sorted Array)
<https://blog.csdn.net/weixin_41793113/article/details/82748904>

leetcode 53. Maximal sum of subsequences (Maximum Subarray)
<https://blog.csdn.net/weixin_41793113/article/details/82762133>

leetcode 20. Valid parentheses (Valid Parentheses)
<https://blog.csdn.net/weixin_41793113/article/details/82194984>

leetcode 141. Circular list (Linked List Cycle)
<https://blog.csdn.net/weixin_41793113/article/details/82724648>

leetcode 160. Intersecting linked list (Intersection of Two Linked Lists)
<https://blog.csdn.net/weixin_41793113/article/details/82725326>

leetcode 14. Longest Common Prefix (Longest Common Prefix)
<https://blog.csdn.net/weixin_41793113/article/details/82746913>

leetcode 7. Reverse integer (Reverse Integer)
<https://blog.csdn.net/weixin_41793113/article/details/82746972>

leetcode 78. subset (Subsets) beat 100%
<https://blog.csdn.net/weixin_41793113/article/details/82747368>

leetcode 59. Spiral matrix II(Spiral Matrix II)
<https://blog.csdn.net/weixin_41793113/article/details/82762203>

leetcode 46. Permutation (Permutations) beat 99.28%
<https://blog.csdn.net/weixin_41793113/article/details/82725439>

leetcode 230. In binary search tree K Small elements (Kth Smallest Element in a BST)
<https://blog.csdn.net/weixin_41793113/article/details/82762284>

leetcode 238. The product of an array other than itself (Product of Array Except Self) beat 100%
<https://blog.csdn.net/weixin_41793113/article/details/82794638>

leetcode 89. Gray coding (Gray Code)
<https://blog.csdn.net/weixin_41793113/article/details/82794986>

leetcode 148. Sort linked list (Sort List)
<https://blog.csdn.net/weixin_41793113/article/details/82762356>

leetcode 215. In array K Maximum elements (Kth Largest Element in an Array)
<https://blog.csdn.net/weixin_41793113/article/details/82779888>

leetcode 62. Different paths (Unique Paths)
<https://blog.csdn.net/weixin_41793113/article/details/82774565>

leetcode 11. Container for the most water (Container With Most Water)
<https://blog.csdn.net/weixin_41793113/article/details/82774746>

leetcode 236. The nearest common ancestor of binary trees (Lowest Common Ancestor of a Binary Tree)
<https://blog.csdn.net/weixin_41793113/article/details/82795013>

 

leetcode 61. Rotating list (Rotate List)
<https://blog.csdn.net/weixin_41793113/article/details/82774293>

leetcode 43. String multiplication (Multiply Strings)
<https://blog.csdn.net/weixin_41793113/article/details/82762608>

 

leetcode 54. Spiral matrix (Spiral Matrix)
<https://blog.csdn.net/weixin_41793113/article/details/82774205>

leetcode 2. Add two numbers together (Add Two Numbers)
<https://blog.csdn.net/weixin_41793113/article/details/82794414>

leetcode 142. Circular list II(Linked List Cycle II)
<https://blog.csdn.net/weixin_41793113/article/details/82762687>

leetcode 5. Longest Palindromic Substring (Longest Palindromic Substring)
<https://blog.csdn.net/weixin_41793113/article/details/82775363>

leetcode 15. Sum of three numbers (3Sum)
<https://blog.csdn.net/weixin_41793113/article/details/82775018>

 

leetcode 23. merge K Sorted list (Merge k Sorted Lists)
<https://blog.csdn.net/weixin_41793113/article/details/82780061>

 

To be updated (* There is an upper limit , It can only be released in one day 10 piece )