/leetcode

LeetCode Problems' Solutions (up-to-date)

Primary LanguageC++

LeetCode

###LeetCode Algorithm

(Notes: "♥" means you need buy a book from Leetcode)

# Title Solution Difficulty
223 Sliding Window Maximum C++ Hard
222 Product of Array Except Self C++ Medium
221 Delete Node in a Linked List C++ Easy
220 Lowest Common Ancestor of a Binary Tree C++ Medium
219 Lowest Common Ancestor of a Binary Search Tree C++ Easy
218 Palindrome Linked List C++ Easy
217 Number of Digit One C++ Medium
216 Implement Queue using Stacks C++ Easy
215 Power of Two C++ Easy
214 Kth Smallest Element in a BST C++ Medium
213 Majority Element II C++ Medium
212 Summary Ranges C++ Easy
211 Basic Calculator II C++ Medium
210 Invert Binary Tree C++ Easy
209 Implement Stack using Queues C++ Medium
208 Basic Calculator C++ Medium
207 Rectangle Area C++ Easy
206 Count Complete Tree Nodes C++ Medium
205 Maximal Square C++ Medium
204 Contains Duplicate III C++ Medium
203 Contains Duplicate II C++ Easy
202 The Skyline Problem C++ Hard
201 Contains Duplicate C++ Easy
200 Combination Sum III C++ Medium
199 Kth Largest Element in an Array C++ Medium
198 Shortest Palindrome C++ Hard
197 House Robber II C++ Medium
196 Word Search II C++ Hard
195 Add and Search Word - Data structure design C++ Medium
194 Course Schedule II C++ Medium
193 Minimum Size Subarray Sum C++ Medium
192 Implement Trie (Prefix Tree) C++ Medium
191 Course Schedule C++ Medium
190 Reverse Linked List C++ Easy
189 Isomorphic Strings C++ Easy
188 Count Primes C++ Easy
187 Remove Linked List Elements C++ Easy
186 Happy Number C++ Easy
185 Bitwise AND of Numbers Range C++ Medium
184 Number of Islands C++ Medium
183 Binary Tree Right Side View C++ Medium
182 House Robber C++ Easy
181 Number of 1 Bits C++ Easy
180 Reverse Bits C++ Easy
179 Rotate Array C++ Easy
178 Best Time to Buy and Sell Stock IV C++ Hard
177 Repeated DNA Sequences C++ Medium
176 Reverse Words in a String II ♥ C++ Medium
175 Largest Number C++ Medium
174 Dungeon Game C++ Hard
173 Binary Search Tree Iterator C++ Medium
172 Factorial Trailing Zeroes C++ Easy
171 Excel Sheet Column Number C++ Easy
170 Two Sum III - Data structure design ♥ C++ Easy
169 Majority Element C++ Easy
168 Excel Sheet Column Title C++ Easy
167 Two Sum II - Input array is sorted ♥ C++ Medium
166 Fraction to Recurring Decimal C++ Medium
165 Compare Version Numbers C++ Easy
164 Maximum Gap C++ Hard
163 Missing Ranges ♥ C++ Medium
162 Find Peak Element C++ Medium
161 One Edit Distance♥ C++ Medium
160 Intersection of Two Linked Lists C++ Easy
159 Longest Substring with At Most Two Distinct Characters ♥ C++ Hard
158 Read N Characters Given Read4 II - Call multiple times ♥ C++ Hard
157 Read N Characters Given Read4 ♥ C++ Easy
156 Binary Tree Upside Down ♥ C++ Medium
155 Min Stack C++ Easy
154 Find Minimum in Rotated Sorted Array II C++ Hard
153 Find Minimum in Rotated Sorted Array C++ Medium
152 Maximum Product Subarray C++ Medium
151 Reverse Words in a String C++ Medium
150 Evaluate Reverse Polish Notation C++ Medium
149 Max Points on a Line C++ Hard
148 Sort List C++ Medium
147 Insertion Sort List C++ Medium
146 LRU Cache C++ Hard
145 Binary Tree Postorder Traversal C++ Hard
144 Binary Tree Preorder Traversal C++ Medium
143 Reorder List C++ Medium
142 Linked List Cycle II C++ Medium
141 Linked List Cycle C++ Medium
140 Word Break II C++ Hard
139 Word Break C++ Medium
138 Copy List with Random Pointer C++ Hard
137 Single Number II C++ Medium
136 Single Number C++ Medium
135 Candy C++ Hard
134 Gas Station C++ Medium
133 Clone Graph C++ Medium
132 Palindrome Partitioning II C++ Hard
131 Palindrome Partitioning C++ Medium
130 Surrounded Regions C++ Medium
129 Sum Root to Leaf Numbers C++ Medium
128 Longest Consecutive Sequence C++ Hard
127 Word Ladder II C++ Hard
126 Word Ladder C++ Medium
125 Valid Palindrome C++ Easy
124 Binary Tree Maximum Path Sum C++ Hard
123 Best Time to Buy and Sell Stock III C++ Hard
122 Best Time to Buy and Sell Stock II C++ Medium
121 Best Time to Buy and Sell Stock C++ Medium
120 Triangle C++ Medium
119 Pascal's Triangle II C++ Easy
118 Pascal's Triangle C++ Easy
117 Populating Next Right Pointers in Each Node II C++ Hard
116 Populating Next Right Pointers in Each Node C++ Medium
115 Distinct Subsequences C++ Hard
114 Flatten Binary Tree to Linked List C++ Medium
113 Path Sum II C++ Medium
112 Path Sum C++ Easy
111 Minimum Depth of Binary Tree C++ Easy
110 Balanced Binary Tree C++ Easy
109 Convert Sorted List to Binary Search Tree C++ Medium
108 Convert Sorted Array to Binary Search Tree C++ Medium
107 Binary Tree Level Order Traversal II C++ Easy
106 Construct Binary Tree from Inorder and Postorder Traversal C++ Medium
105 Construct Binary Tree from Preorder and Inorder Traversal C++ Medium
104 Maximum Depth of Binary Tree C++ Easy
103 Binary Tree Zigzag Level Order Traversal C++ Medium
102 Binary Tree Level Order Traversal C++ Easy
101 Symmetric Tree C++ Easy
100 Same Tree C++ Easy
99 Recover Binary Search Tree C++ Hard
98 Validate Binary Search Tree C++ Medium
97 Interleaving String C++ Hard
96 Unique Binary Search Trees II C++ Medium
95 Unique Binary Search Trees C++ Medium
94 Binary Tree Inorder Traversal C++ Medium
93 Restore IP Addresses C++ Medium
92 Reverse Linked List II C++ Medium
91 Subsets II C++ Medium
90 Decode Ways C++ Medium
89 Gray Code C++ Medium
88 Merge Sorted Array C++ Easy
87 Scramble String C++ Hard
86 Partition List C++ Medium
85 Maximal Rectangle C++ Hard
84 Largest Rectangle in Histogram C++ Hard
83 Remove Duplicates from Sorted List II C++ Medium
82 Remove Duplicates from Sorted List C++ Easy
81 Search in Rotated Sorted Array II C++ Medium
80 Remove Duplicates from Sorted Array II C++ Medium
79 Word Search C++ Medium
78 Subsets C++ Medium
77 Combinations C++ Medium
76 Minimum Window Substring C++ Hard
75 Sort Colors C++ Medium
74 Search a 2D Matrix C++ Medium
73 Set Matrix Zeroes C++ Medium
72 Edit Distance C++ Hard
71 Simplify Path C++ Medium
70 Climbing Stairs C++ Easy
69 Sqrt(x) C++ Medium
68 Text Justification C++ Hard
67 Plus One C++ Easy
66 Valid Number C++ Easy
65 Add Binary C++ Easy
64 Merge Two Sorted Lists C++ Easy
63 Minimum Path Sum C++ Medium
62 Unique Paths II C++ Medium
61 Unique Paths C++ Medium
60 Rotate List C++ Medium
59 Permutation Sequence C++ Medium
58 Spiral Matrix II C++ Medium
57 Length of Last Word C++ Easy
56 Insert Interval C++ Hard
55 Merge Intervals C++ Hard
54 Jump Game C++ Medium
53 Spiral Matrix C++ Medium
52 Maximum Subarray C++ Medium
51 N-Queens II C++ Hard
50 N-Queens C++ Hard
49 "Pow(x, n)" C++ Medium
48 Anagrams C++ Medium
47 Rotate Image C++ Medium
46 Permutations II C++ Hard
45 Permutations C++ Medium
44 Jump Game II C++ Hard
43 Wildcard Matching C++ Hard
42 Multiply Strings C++ Medium
41 Trapping Rain Water C++ Hard
40 First Missing Positive C++ Hard
39 Combination Sum II C++ Medium
38 Combination Sum C++ Medium
37 Count and Say C++ Easy
36 Sudoku Solver C++ Hard
35 Valid Sudoku C++ Easy
34 Search Insert Position C++ Medium
33 Search for a Range C++ Medium
32 Search in Rotated Sorted Array C++ Hard
31 Longest Valid Parentheses C++ Hard
30 Next Permutation C++ Medium
29 Substring with Concatenation of All Words C++ Hard
28 Divide Two Integers C++ Medium
27 Implement strStr() C++ Easy
26 Remove Element C++ Easy
25 Remove Duplicates from Sorted Array C++ Easy
24 Reverse Nodes in k-Group C++ Hard
23 Swap Nodes in Pairs C++ Medium
22 Merge k Sorted Lists C++ Hard
21 Generate Parentheses C++ Medium
20 Valid Parentheses C++ Easy
19 Remove Nth Node From End of List C++ Easy
18 Letter Combinations of a Phone Number C++ Medium
17 4Sum C++ Medium
16 3Sum Closest C++ Medium
15 3Sum C++ Medium
14 Longest Common Prefix C++ Easy
13 Roman to Integer C++ Easy
12 Integer to Roman C++ Medium
11 Container With Most Water C++ Medium
10 Regular Expression Matching C++ Hard
9 Palindrome Number C++ Easy
8 String to Integer (atoi) C++ Easy
7 Reverse Integer C++ Easy
6 ZigZag Conversion C++ Easy
5 Longest Palindromic Substring C++ Medium
4 Add Two Numbers C++ Medium
3 Longest Substring Without Repeating Characters C++ Medium
2 Median of Two Sorted Arrays C++ Hard
1 Two Sum C++ Medium

###LeetCode Shell

# Title Solution Difficulty
4 Tenth Line Bash Easy
3 Transpose File Bash Medium
2 Valid Phone Numbers Bash Easy
1 Word Frequency Bash Medium