Leetcode高頻題頻率表(轉載)

Leetcode Questions
ID	QUESTION	DIFFICULTY	FREQENCY	DATA STRUCTURES
58	Length of Last Word	1	1	string
100	Same Tree	1	1	tree
104	Maximum Depth of Binary Tree	1	1	tree
111	Minimum Depth of Binary Tree	1	1	tree
126	Word Ladder II	1	1
14	Longest Common Prefix	2	1	string
118	Pascal’s Triangle	2	1	array
119	Pascal’s Triangle II	2	1	array
121	Best Time to Buy and Sell Stock	2	1	array
6	ZigZag Conversion	3	1	string
16	3Sum Closest	3	1	array
30	Substring with Concatenation of All Words	3	1	string
71	Simplify Path	3	1	string
96	Unique Binary Search Trees	3	1	tree
107	Binary Tree Level Order Traversal II	3	1	tree
120	Triangle	3	1	array
122	Best Time to Buy and Sell Stock II	3	1	array
32	Longest Valid Parentheses	4	1	string
95	Unique Binary Search Trees II	4	1	tree
123	Best Time to Buy and Sell Stock III	4	1	array
60	Permutation Sequence	5	1
85	Maximal Rectangle	5	1	array
66	Plus One	1	2	array
101	Symmetric Tree	1	2	tree
110	Balanced Binary Tree	1	2	tree
9	Palindrome Number	2	2
35	Search Insert Position	2	2	array
36	Valid Sudoku	2	2	array
38	Count and Say	2	2	string
80	Remove Duplicates from Sorted Array II	2	2	array
113	Path Sum II	2	2	tree
3	Longest Substring Without Repeating Characters	3	2	string, hashtable
11	Container With Most Water	3	2	array
18	4Sum	3	2	array
55	Jump Game	3	2	array
59	Spiral Matrix II	3	2	array
61	Rotate List	3	2	linked list
92	Reverse Linked List II	3	2	linked list
5	Longest Palindromic Substring	4	2	string
25	Reverse Nodes in k-Group	4	2	linked list
37	Sudoku Solver	4	2	array
40	Combination Sum II	4	2	array
42	Trapping Rain Water	4	2	array
45	Jump Game II	4	2	array
47	Permutations II	4	2	array
48	Rotate Image	4	2	array
54	Spiral Matrix	4	2	array
68	Text Justification	4	2	string
75	Sort Colors	4	2	array
76	Minimum Window Substring	4	2	string
89	Gray Code	4	2
90	Subsets II	4	2	array
99	Recover Binary Search Tree	4	2	tree
115	Distinct Subsequences	4	2	string
117	Populating Next Right Pointers in Each Node II	4	2	tree
124	Binary Tree Maximum Path Sum	4	2	tree
31	Next Permutation	5	2	array
41	First Missing Positive	5	2	array
84	Largest Rectangle in Histogram	5	2	array
87	Scramble String	5	2	string
97	Interleaving String	5	2	string
26	Remove Duplicates from Sorted Array	1	3	array
83	Remove Duplicates from Sorted List	1	3	linked list
112	Path Sum	1	3	tree
7	Reverse Integer	2	3
19	Remove Nth Node From End of List	2	3	linked list
62	Unique Paths	2	3	array
108	Convert Sorted Array to Binary Search Tree	2	3	tree
17	Letter Combinations of a Phone Number	3	3	string
39	Combination Sum	3	3	array
53	Maximum Subarray	3	3	array
63	Unique Paths II	3	3	array
64	Minimum Path Sum	3	3	array
74	Search a 2D Matrix	3	3	array
82	Remove Duplicates from Sorted List II	3	3	linked list
86	Partition List	3	3	linked list
93	Restore IP Addresses	3	3	string
105	Construct Binary Tree from Preorder and Inorder Tr	3	3	array, tree
106	Construct Binary Tree from Inorder and Postorder T	3	3	array, tree
114	Flatten Binary Tree to Linked List	3	3	tree
116	Populating Next Right Pointers in Each Node	3	3	tree
29	Divide Two Integers	4	3
33	Search in Rotated Sorted Array	4	3	array
34	Search for a Range	4	3	array
43	Multiply Strings	4	3	string
51	N-Queens	4	3	array
52	N-Queens II	4	3	array
72	Edit Distance	4	3	string
94	Binary Tree Inorder Traversal	4	3	tree, hashtable
103	Binary Tree Zigzag Level Order Traversal	4	3	queue, tree
109	Convert Sorted List to Binary Search Tree	4	3	linked list
128	Longest Consecutive Sequence	4	3	array
130	Surrounded Regions	4	3	array
132	Palindrome Partitioning II	4	3	string
4	Median of Two Sorted Arrays	5	3	array
10	Regular Expression Matching	5	3	string
44	Wildcard Matching	5	3	string
81	Search in Rotated Sorted Array II	5	3	array
27	Remove Element	1	4	array
13	Roman to Integer	2	4
24	Swap Nodes in Pairs	2	4	linked list
67	Add Binary	2	4	string
129	Sum Root to Leaf Numbers	2	4	tree
2	Add Two Numbers	3	4	linked list
12	Integer to Roman	3	4
22	Generate Parentheses	3	4	string
23	Merge k Sorted Lists	3	4	linked list, heap
46	Permutations	3	4	array
49	Anagrams	3	4	string, hashtable
77	Combinations	3	4
78	Subsets	3	4	array
79	Word Search	3	4	array
91	Decode Ways	3	4	string
102	Binary Tree Level Order Traversal	3	4	tree
131	Palindrome Partitioning	3	4	string
69	Sqrt(x)	4	4
1	Two Sum	2	5	array, set
8	String to Integer (atoi)	2	5	string
20	Valid Parentheses	2	5	string
21	Merge Two Sorted Lists	2	5	linked list
65	Valid Number	2	5	string
70	Climbing Stairs	2	5
88	Merge Sorted Array	2	5	array
125	Valid Palindrome	2	5	string
15	3Sum	3	5	array
50	Pow(x, n)	3	5
73	Set Matrix Zeroes	3	5	array
98	Validate Binary Search Tree	3	5	tree
127	Word Ladder	3	5	graph
28	Implement strStr()	4	5	string
56	Merge Intervals	4	5	array, linked list, red-black tree
57	Insert Interval	4	5	array, linked list, red-black tree