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leetcode面试频率及总结

2015-11-23 10:16 316 查看


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

思路方法总结：

题目	算法	数据结构	注意事项
Clone Graph	BFS	哈希表
Word Ladder II	BFS	哈希表
Surrounded Regions	BFS	矩阵
Word Ladder	BFS	N/A
Binary Tree Level Order Traversal	BFS\|前序遍历	队列
Binary Tree Level Order Traversal II	BFS\|前序遍历	队列
Binary Tree Zigzag Level Order Traversal	BFS\|前序遍历	队列	每一层顺序分别对待
Implement strStr()	KMP算法	N/A
Copy List with Random Pointer	N/A	哈希表
Remove Duplicates from Sorted Array	N/A	哈希表
Remove Duplicates from Sorted Array II	N/A	哈希表
Set Matrix Zeroes	N/A	哈希表
Anagrams	N/A	哈希表
First Missing Positive	N/A	哈希表
Two Sum	N/A	哈希表
Evaluate Reverse Polish Notation	N/A	堆栈
Largest Rectangle in Histogram	N/A	堆栈	记录重要位置
Minimum Window Substring	N/A	堆栈
Simplify Path	N/A	堆栈
Longest Valid Parentheses	N/A	堆栈
Valid Parentheses	N/A	堆栈	词法分析
Container With Most Water	N/A	堆栈	记录重要位置
Reverse Words in a String	N/A	堆栈	翻转字符串
Best Time to Buy and Sell Stock	N/A	数组
Best Time to Buy and Sell Stock II	N/A	数组
Best Time to Buy and Sell Stock III	N/A	数组
Length of Last Word	N/A	数组
Search Insert Position	N/A	数组
Search for a Range	N/A	数组
Spiral Matrix	N/A	矩阵	简化为子问题
Spiral Matrix II	N/A	矩阵	简化为子问题
LRU Cache	N/A	链表
Reorder List	N/A	链表	快慢指针&链表倒序
Linked List Cycle	N/A	链表	快慢指针
Linked List Cycle II	N/A	链表	快慢指针
Reverse Linked List II	N/A	链表
Partition List	N/A	链表
Remove Duplicates from Sorted List	N/A	链表
Remove Duplicates from Sorted List II	N/A	链表
Merge Two Sorted Lists	N/A	链表
Rotate List	N/A	链表	快慢指针
Reverse Nodes in k-Group	N/A	链表
Swap Nodes in Pairs	N/A	链表
Remove Nth Node From End of List	N/A	链表	快慢指针
Text Justification	N/A	队列
Candy	N/A	N/A	简化为子问题
Valid Palindrome	N/A	N/A	首尾指针
Plus One	N/A	N/A	模拟加法运算
Valid Number	N/A	N/A	词法分析
Add Binary	N/A	N/A	模拟加法运算
Insert Interval	N/A	N/A
Merge Intervals	N/A	N/A
Multiply Strings	N/A	N/A	模拟乘法运算
Trapping Rain Water	N/A	N/A
Valid Sudoku	N/A	N/A
Roman to Integer	N/A	N/A
Integer to Roman	N/A	N/A
Palindrome Number	N/A	N/A
Reverse Integer	N/A	N/A
ZigZag Conversion	N/A	N/A
Add Two Numbers	N/A	N/A	模拟加法运算
Median of Two Sorted Arrays	N/A	N/A
String to Integer (atoi)	STL函数	N/A
Next Permutation	STL经典算法	N/A
Recover Binary Search Tree	中序遍历	二叉树
3Sum	二分查找	N/A
3Sum Closest	二分查找	N/A
4Sum	二分查找	N/A
Single Number	位运算	N/A
Single Number II	位运算	N/A
Construct Binary Tree from Preorder and Inorder Traversal	前序中序遍历	N/A
Binary Tree Preorder Traversal	前序遍历	二叉树
Flatten Binary Tree to Linked List	前序遍历	二叉树
Interleaving String	动态规划	二叉树
Unique Binary Search Trees	动态规划	二叉树
Word Break	动态规划	N/A
Word Break II	动态规划	N/A
Palindrome Partitioning	动态规划	N/A
Palindrome Partitioning II	动态规划	N/A
Triangle	动态规划	N/A
Distinct Subsequences	动态规划	N/A
Decode Ways	动态规划	N/A
Scramble String	动态规划	N/A
Maximal Rectangle	动态规划	N/A
Edit Distance	动态规划	N/A
Climbing Stairs	动态规划	N/A
Minimum Path Sum	动态规划	N/A
Unique Paths	动态规划	N/A
Unique Paths II	动态规划	N/A
Jump Game	动态规划	N/A
Jump Game II	动态规划	N/A
Maximum Subarray	动态规划	N/A
Wildcard Matching	动态规划	N/A
Substring with Concatenation of All Words	动态规划	N/A
Sort List	合并排序	链表	快慢指针
Merge Sorted Array	合并排序	N/A
Construct Binary Tree from Inorder and Postorder Traversal	后序中序遍历	N/A
Binary Tree Postorder Traversal	后续遍历	二叉树
Combinations	回溯	N/A
Permutation Sequence	回溯	N/A
N-Queens	回溯	N/A
N-Queens II	回溯	N/A
Permutations	回溯	N/A
Permutations II	回溯	N/A
Combination Sum	回溯	N/A
Combination Sum II	回溯	N/A
Sudoku Solver	回溯	N/A
Longest Substring Without Repeating Characters	回溯	N/A
Max Points on a Line	循环遍历	N/A	排除相同的点
Longest Common Prefix	循环遍历	N/A
Longest Palindromic Substring	循环遍历	N/A
Insertion Sort List	插入排序	链表
Rotate Image	矢量旋转与平移	N/A
Longest Consecutive Sequence	类BFS	哈希表
Search in Rotated Sorted Array	类二分查找	N/A
Search in Rotated Sorted Array II	类二分查找	N/A	特殊考虑相等数据
Sqrt(x)	类二分查找	N/A
Pow(x, n)	类二进制	N/A
Divide Two Integers	类二进制	N/A
Gas Station	类合并排序	N/A
Merge k Sorted Lists	类外排序	N/A
Sort Colors	类快速排序	N/A
Remove Element	类快速排序	N/A
Search a 2D Matrix	类杨氏矩阵	N/A
Restore IP Addresses	背包问题	N/A
Sum Root to Leaf Numbers	递归	二叉树
Binary Tree Maximum Path Sum	递归	二叉树
opulating Next Right Pointers in Each Node	递归	二叉树
Populating Next Right Pointers in Each Node II	递归	二叉树
Path Sum	递归	二叉树
Path Sum II	递归	二叉树
Maximum Depth of Binary Tree	递归	二叉树
Minimum Depth of Binary Tree	递归	二叉树
Balanced Binary Tree	递归	二叉树
Symmetric Tree	递归	二叉树
Same Tree	递归	二叉树
Validate Binary Search Tree	递归	二叉树
Unique Binary Search Trees II	递归	二叉树
Binary Tree Inorder Traversal	递归	二叉树
Pascal's Triangle	递归	N/A
Pascal's Triangle II	递归	N/A
Convert Sorted List to Binary Search Tree	递归	N/A	快慢指针&反中序遍历
Convert Sorted Array to Binary Search Tree	递归	N/A	反中序遍历
Subsets	递归	N/A
Subsets II	递归	N/A
Gray Code	递归	N/A
Word Search	递归	N/A
Count and Say	递归	N/A
Generate Parentheses	递归	N/A
Letter Combinations of a Phone Number	递归	N/A
Regular Expression Matching	递归	N/A

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