Collection of Programming Challenges for AnkiCode

https://github.com/daveight/ankicode

Decks

• Decks src code is located in the src folder
• Compiled decks are located in the dist folder in .csv format

Build decks

Build decks with the following command: python3 build_decks.py As the result, csv files will be generated and placed into dist folder

Add new coding problems to the existing deck

• title/<problem_name> - contains a title of a new coding problem
• description/<problem_name> - contains a text description of a new coding problem
• fn_names/<problem_name> - function name which will be used in the solution template
• solutions/cpp/<problem_name> - markdown file containing C++ solution of a problem
• solutions/python/<problem_name> - markdown file containing Python solution of a problem
• solutions/java/<problem_name> - markdown file containing Java solution of a problem
• solutions/js/<problem_name> - markdown file containing JavaScript solution of a problem
• test_cases/<problem_name> - a TSV (tab-separated) file with test-cases

Programming Challenge Decks

LeetCode

Decks based on LeetCode problems https://github.com/interviewcoder/leetcode.

Name	Count	Link	Size
Easy	50	easy.apkg	31 KB
Medium	114	medium.apkg	103 KB
Hard	44	hard.apkg	51 KB

Problems List

#	Name	Complexity	Tags
1	ZigZag Conversion	Easy	String
2	Reverse Integer	Easy	Math
3	Palindrome Number	Easy	Math
4	Roman to Integer	Easy	Math String
5	Longest Common Prefix	Easy	String
6	Remove Nth Node From End of List	Easy	Linked List Two Pointers
7	Valid Parentheses	Easy	Stack String
8	Merge Two Sorted Lists	Easy	Linked List
9	Remove Duplicates from Sorted Array	Easy	Array Two Pointers
10	Remove Element	Easy	Array Two Pointers
11	Implement strStr()	Easy	Two Pointers String
12	Valid Sudoku	Easy	Hash Table
13	Count and Say	Easy	String
14	Length of Last Word	Easy	String
15	Plus One	Easy	Array Math
16	Add Binary	Easy	Math String
17	Climbing Stairs	Easy	Dynamic Programming
18	Remove Duplicates from Sorted List	Easy	Linked List
19	Merge Sorted Array	Easy	Array Two Pointers
20	Same Tree	Easy	Tree Depth-first Search
21	Symmetric Tree	Easy	Tree Depth-first Search
22	Binary Tree Level Order Traversal	Easy	Tree Breadth-first Search
23	Maximum Depth of Binary Tree	Easy	Tree Depth-first Search
24	Binary Tree Level Order Traversal II	Easy	Tree Breadth-first Search
25	Balanced Binary Tree	Easy	Tree Depth-first Search
26	Minimum Depth of Binary Tree	Easy	Tree Depth-first Search Breadth-first Search
27	Path Sum	Easy	Tree Depth-first Search
28	Pascal's Triangle	Easy	Array
29	Pascal's Triangle II	Easy	Array
30	Valid Palindrome	Easy	Two Pointers String
31	Intersection of Two Linked Lists	Easy	Linked List
32	Compare Version Numbers	Easy	String
33	Excel Sheet Column Title	Easy	Math
34	Excel Sheet Column Number	Easy	Math
35	Factorial Trailing Zeroes	Easy	Math
36	Rotate Array	Easy	Array
37	Remove Linked List Elements	Easy	Linked List
38	Count Primes	Easy	Hash Table Math
39	Reverse Linked List	Easy	Linked List
40	Contains Duplicate	Easy	Array Hash Table
41	Contains Duplicate II	Easy	Array Hash Table
42	Rectangle Area	Easy	Math
43	Summary Ranges	Easy	Array
44	Power of Two	Easy	Math Bit Manipulation
45	Lowest Common Ancestor of a Binary Search Tree	Easy	Tree
46	Valid Anagram	Easy	Hash Table Sort
47	Strobogrammatic Number	Easy	Hash Table Math
48	Meeting Rooms	Easy	Sort
49	First Bad Version	Easy	Binary Search
50	Move Zeroes	Easy	Array Two Pointers
51	Two Sum	Medium	Array Hash Table
52	Add Two Numbers	Medium	Linked List Math
53	Longest Substring Without Repeating Characters	Medium	Hash Table Two Pointers String
54	Longest Palindromic Substring	Medium	String
55	Container With Most Water	Medium	Array Two Pointers
56	Integer to Roman	Medium	Math String
57	3Sum	Medium	Array Two Pointers
58	3Sum Closest	Medium	Array Two Pointers
59	Letter Combinations of a Phone Number	Medium	Backtracking String
60	4Sum	Medium	Array Hash Table Two Pointers
61	Generate Parentheses	Medium	Backtracking String
62	Swap Nodes in Pairs	Medium	Linked List
63	Divide Two Integers	Medium	Math Binary Search
64	Next Permutation	Medium	Array
65	Search for a Range	Medium	Array Binary Search
66	Search Insert Position	Medium	Array Binary Search
67	Combination Sum	Medium	Array Backtracking
68	Combination Sum II	Medium	Array Backtracking
69	Multiply Strings	Medium	Math String
70	Permutations	Medium	Backtracking
71	Rotate Image	Medium	Array
72	Group Anagrams	Medium	Hash Table String
73	Pow(x, n)	Medium	Math Binary Search
74	Maximum Subarray	Medium	Divide and Conquer Array Dynamic Programming
75	Spiral Matrix	Medium	Array
76	Jump Game	Medium	Array Greedy
77	Spiral Matrix II	Medium	Array
78	Permutation Sequence	Medium	Backtracking Math
79	Rotate List	Medium	Linked List Two Pointers
80	Unique Paths	Medium	Array Dynamic Programming
81	Unique Paths II	Medium	Array Dynamic Programming
82	Minimum Path Sum	Medium	Array Dynamic Programming
83	Sqrt(x)	Medium	Math Binary Search
84	Simplify Path	Medium	Stack String
85	Set Matrix Zeroes	Medium	Array
86	Search a 2D Matrix	Medium	Array Binary Search
87	Sort Colors	Medium	Array Two Pointers Sort
88	Combinations	Medium	Backtracking
89	Subsets	Medium	Array Backtracking Bit Manipulation
90	Word Search	Medium	Array Backtracking
91	Remove Duplicates from Sorted Array II	Medium	Array Two Pointers
92	Search in Rotated Sorted Array II	Medium	Array Binary Search
93	Remove Duplicates from Sorted List II	Medium	Linked List
94	Partition List	Medium	Linked List Two Pointers
95	Gray Code	Medium	Backtracking
96	Subsets II	Medium	Array Backtracking
97	Decode Ways	Medium	Dynamic Programming String
98	Reverse Linked List II	Medium	Linked List
99	Restore IP Addresses	Medium	Backtracking String
100	Binary Tree Inorder Traversal	Medium	Tree Hash Table Stack
101	Unique Binary Search Trees II	Medium	Tree Dynamic Programming
102	Unique Binary Search Trees	Medium	Tree Dynamic Programming
103	Validate Binary Search Tree	Medium	Tree Depth-first Search
104	Binary Tree Zigzag Level Order Traversal	Medium	Tree Breadth-first Search Stack
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Tree Array Depth-first Search
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Tree Array Depth-first Search
107	Convert Sorted Array to Binary Search Tree	Medium	Tree Depth-first Search
108	Convert Sorted List to Binary Search Tree	Medium	Depth-first Search Linked List
109	Path Sum II	Medium	Tree Depth-first Search
110	Flatten Binary Tree to Linked List	Medium	Tree Depth-first Search
111	Triangle	Medium	Array Dynamic Programming
112	Best Time to Buy and Sell Stock	Medium	Array Dynamic Programming
113	Best Time to Buy and Sell Stock II	Medium	Array Greedy
114	Word Ladder	Medium	Breadth-first Search
115	Sum Root to Leaf Numbers	Medium	Tree Depth-first Search
116	Surrounded Regions	Medium	Breadth-first Search
117	Palindrome Partitioning	Medium	Backtracking
118	Single Number	Medium	Hash Table Bit Manipulation
119	Word Break	Medium	Dynamic Programming
120	Linked List Cycle	Medium	Linked List Two Pointers
121	Linked List Cycle II	Medium	Linked List Two Pointers
122	Reorder List	Medium	Linked List
123	Binary Tree Preorder Traversal	Medium	Tree Stack
124	Insertion Sort List	Medium	Linked List Sort
125	Sort List	Medium	Linked List Sort
126	Evaluate Reverse Polish Notation	Medium	Stack
127	Reverse Words in a String	Medium	String
128	Maximum Product Subarray	Medium	Array Dynamic Programming
129	Find Minimum in Rotated Sorted Array	Medium	Array Binary Search
130	Longest Substring with at most Two Distinct Characters	Medium	String
131	One Edit Distance	Medium	String
132	Find Peak Element	Medium	Array Binary Search
133	Missing Ranges	Medium	Array
134	Fraction to Recurring Decimal	Medium	Hash Table Math
135	Binary Search Tree Iterator	Medium	Tree Stack
136	Largest Number	Medium	Sort
137	Reverse words in a string II	Medium	Array
138	Binary Tree Right Side View	Medium	Tree Depth-first Search Breadth-first Search
139	Number of Islands	Medium	Depth-first Search Breadth-first Search
140	Course Schedule	Medium	Depth-first Search Breadth-first Search Graph Topological Sort
141	Minimum Size Subarray Sum	Medium	Array Two Pointers Binary Search
142	Course Schedule II	Medium	Depth-first Search Breadth-first Search Graph Topological Sort
143	House Robber II	Medium	Dynamic Programming
144	Kth Largest Element in an Array	Medium	Divide and Conquer Heap
145	Combination Sum III	Medium	Array Backtracking
146	Contains Duplicate III	Medium	Binary Search Tree
147	Maximal Square	Medium	Dynamic Programming
148	Basic Calculator	Medium	Stack Math
149	Majority Element II	Medium	Array
150	Kth Smallest Element in a BST	Medium	Tree Binary Search
151	Lowest Common Ancestor of a Binary Tree	Medium	Tree
152	Product of Array Except Self	Medium	Array
153	Search a 2D Matrix II	Medium	Divide and Conquer Binary Search
154	Flatten2DVector	Medium	Design
155	Meeting Rooms II	Medium	Heap Greedy Sort
156	Paint House	Medium	Dynamic Programming
157	Graph Valid Tree	Medium	Breadth-first Search Depth-first Search Graph Union-Find
158	Missing Number	Medium	Array Math Bit Manipulation
159	Integer to English Words	Medium	Math String
160	H-Index	Medium	Hash Table Sort
161	H-Index II	Medium	Binary Search
162	Paint Fence	Medium	Dynamic Programming
163	Peeking Iterator	Medium	Design
164	Inorder Successor in BST	Medium	Tree
165	Walls And Gates	Medium	BFS
166	Median of Two Sorted Arrays	Hard	Divide and Conquer Array Binary Search
167	Regular Expression Matching	Hard	Dynamic Programming Backtracking String
168	Merge k Sorted Lists	Hard	Divide and Conquer Linked List Heap
169	Substring with Concatenation of All Words	Hard	Hash Table Two Pointers String
170	Longest Valid Parentheses	Hard	Dynamic Programming String
171	Search in Rotated Sorted Array	Hard	Array Binary Search
172	Sudoku Solver	Hard	Backtracking Hash Table
173	First Missing Positive	Hard	Array
174	Trapping Rain Water	Hard	Array Stack Two Pointers
175	Wildcard Matching	Hard	Dynamic Programming Backtracking Greedy String
176	Jump Game II	Hard	Array Greedy
177	Permutations II	Hard	Backtracking
178	N-Queens	Hard	Backtracking
179	N-Queens II	Hard	Backtracking
180	Merge Intervals	Hard	Array Sort
181	Insert Interval	Hard	Array Sort
182	Valid Number	Hard	Math String
183	Text Justification	Hard	String
184	Edit Distance	Hard	Dynamic Programming String
185	Minimum Window Substring	Hard	Hash Table Two Pointers String
186	Largest Rectangle in Histogram	Hard	Array Stack
187	Maximal Rectangle	Hard	Array Hash Table Stack Dynamic Programming
188	Scramble String	Hard	Dynamic Programming String
189	Interleaving String	Hard	Dynamic Programming String
190	Recover Binary Search Tree	Hard	Tree Depth-first Search
191	Distinct Subsequences	Hard	Dynamic Programming String
192	Best Time to Buy and Sell Stock III	Hard	Array Dynamic Programming
193	Binary Tree Maximum Path Sum	Hard	Tree Depth-first Search
194	Word Ladder II	Hard	Array Backtracking Breadth-first Search String
195	Longest Consecutive Sequence	Hard	Array
196	Palindrome Partitioning II	Hard	Dynamic Programming
197	Candy	Hard	Greedy
198	Word Break II	Hard	Dynamic Programming Backtracking
199	Binary Tree Postorder Traversal	Hard	Tree Stack
200	Max Points on a Line	Hard	Hash Table Math
201	Find Minimum in Rotated Sorted Array II	Hard	Array Binary Search
202	Maximum Gap	Hard	Sort
203	Dungeon Game	Hard	Dynamic Programming Binary Search
204	Best Time to Buy and Sell Stock IV	Hard	Dynamic Programming
205	Word Search II	Hard	Backtracking Trie
206	The Skyline Problem	Hard	Divide and Conquer Heap
207	Sliding Window Maximum	Hard	Heap
208	Paint House	Hard	Dynamic Programming
209	Alien Dictionary	Hard	Graph Topological Sort

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Elements of Programming Interviews

Decks based on the book "Elements of Programming Interviews" by Adnan Aziz, Tsung-Hsien Lee, Amin Prakash.

Name	Count	Link	Size
Arrays	27	arrays.apkg	3.36 MB
Binary Search Trees	13	binary_search_trees.apkg	7.03 MB
Binary Trees	16	binary_trees.apkg	6.85 MB
Dynamic Programming	18	dynamic_programming.apkg	745 KB
Graphs	12	graphs.apkg	2.21 MB
Greedy Algorithms	7	greedy_algorithms.apkg	862 KB
Hash Tables	12	hash_tables.apkg	2.06 MB
Heaps	7	heaps.apkg	1.77 MB
Linked Lists	15	linked_lists.apkg	5.7 MB
Primitive Types	11	primitive_types.apkg	1.2 MB
Recursion	13	recursion.apkg	567 KB
Searching	16	searching.apkg	2.98 MB
Sorting	12	sorting.apkg	1.28 MB
Stacks & Queues	7	stacks_and_queues.apkg	839 KB
Strings	18	strings.apkg	1.31 MB

Problems List

#	Name	Tags
1	Jumping game.	Arrays
2	Alternating Array	Arrays
3	Apply Permutation.	Arrays
4	Stock Buy Sell to Maximize Profit.	Arrays
5	Stock Buy Sell K Times to Maximize Profit.	Arrays
6	Stock Buy Sell Twice to Maximize Profit.	Arrays
7	The Dutch National Flag Problem	Arrays
8	Even odd array	Arrays
9	Increment an arbitrary-precision integer	Arrays
10	Multiply two arbitrary-precision integers	Arrays
11	The Sudoku checker problem	Arrays
12	Compute the longest contiguous increasing subarray	Arrays
13	Find the longest subarray whose sum <= k	Arrays
14	Rotate a 2D array	Arrays
15	Compute the maximum product of all entries but one	Arrays
16	Find the maximum square 2D subarray	Arrays
17	Find the maximum 2D subarray	Arrays
18	Trapping water	Arrays
19	Compute the maximum subarray sum in a circular array	Arrays
20	Compute the next permutation	Arrays
21	Compute rows in Pascal's Triangle	Arrays
22	Enumerate all primes to n	Arrays
23	Identify positions attacked by rooks	Arrays
24	Rotate an array	Arrays
25	Smallest nonconstructible value	Arrays
26	Delete duplicates from a sorted array	Arrays
27	Compute the spiral ordering of a 2D array	Arrays
28	Square Root Range.	Binary search trees
29	Reconstruct a BST from traversal data	Binary search trees
30	Build a minimum height bst from a sorted array	Binary search trees
31	Merge two BSTs	Binary search trees
32	Convert a BST to a sorted doubly linked list	Binary search trees
33	Test if three BST nodes are totally ordered	Binary search trees
34	Test if a binary tree satisfies the BST property	Binary search trees
35	Find the k largest elements in a BST	Binary search trees
36	Compute the LCA in a BST	Binary search trees
37	Find the closest entries in three sorted arrays	Binary search trees
38	The range lookup problem	Binary search trees
39	Find the first key greater than a given value in a BST	Binary search trees
40	Search a sorted array for first occurrence of k	Binary search trees
41	Compute the k-th node in an inorder traversal	Binary trees
42	Test if a binary tree is height-balanced	Binary trees
43	Test if a binary tree is symmetric	Binary trees
44	Compute the kth node in an inorder traversal	Binary trees
45	Compute the lowest common ancestor in a binary tree	Binary trees
46	Find a root to leaf path with specified sum	Binary trees
47	Compute the successor	Binary trees
48	Sum the root-to-leaf paths in a binary tree	Binary trees
49	Form a linked list from the leaves of a binary tree	Binary trees
50	Compute the exterior of a binary tree	Binary trees
51	Reconstruct a binary tree from traversal data	Binary trees
52	Implement an inorder traversal without recursion	Binary trees
53	Implement a postorder traversal without recursion	Binary trees
54	Implement a preorder traversal without recursion	Binary trees
55	Compute the right sibling tree	Binary trees
56	Implement an inorder traversal with O(1) space	Binary trees
57	Binomial Coefficients.	Dynamic programming
58	Checkerboard problem	Dynamic programming
59	Drawing the Skyline	Dynamic programming
60	fibonacci	Dynamic programming
61	The bedbathandbeyond.com problem	Dynamic programming
62	Search for a sequence in a 2D array	Dynamic programming
63	The knapsack problem	Dynamic programming
64	Compute the Levenshtein distance	Dynamic programming
65	Find the longest nondecreasing subsequence	Dynamic programming
66	Matrix Chain Multiplication	Dynamic programming
67	Bootcamp: Dynamic Programming	Dynamic programming
68	Find the minimum weight path in a triangle	Dynamic programming
69	Count the number of score combinations	Dynamic programming
70	Count the number of ways to traverse a 2D array	Dynamic programming
71	Count the number of moves to climb stairs	Dynamic programming
72	Pick up coins for maximum gain	Dynamic programming
73	The pretty printing problem	Dynamic programming
74	Count of balanced 0–1 matrices	Dynamic programming
75	Arbitrage.	Graphs
76	Deadlock Detection	Graphs
77	Find all paths in a graph using Breadth First Search	Graphs
78	Making wired connections	Graphs
79	Compute enclosed regions	Graphs
80	Team photo day - 2	Graphs
81	Paint a Boolean matrix	Graphs
82	Road network	Graphs
83	Kosaraju's algorithm	Graphs
84	Search a maze	Graphs
85	Transform one string to another	Graphs
86	Topological Sorting	Graphs
87	Synthesize an Expression	Greedy algorithms
88	Compute the largest rectangle under the skyline	Greedy algorithms
89	Find the majority element	Greedy algorithms
90	Compute the maximum water trapped by a pair of vertical lines	Greedy algorithms
91	The interval covering problem	Greedy algorithms
92	Schedule to minimize waiting time	Greedy algorithms
93	Compute an optimum assignment of tasks	Greedy algorithms
94	The 3-sum problem	Greedy algorithms
95	The interval covering problem	Greedy algorithms
96	Anagrams.	Hash tables
97	Collatz Conjecture.	Hash tables
98	Is an anonymous letter constructible?	Hash tables
99	Test for palindromic permutations	Hash tables
100	Find the line through the most points	Hash tables
101	Find the length of a longest contained interval	Hash tables
102	Find the longest subarray with distinct entries	Hash tables
103	Find the nearest repeated entries in an array	Hash tables
104	The heavy hitter problem	Hash tables
105	Find smallest subarray sequentially covering all values	Hash tables
106	Find the smallest subarray covering all values	Hash tables
107	Compute all string decompositions	Hash tables
108	Reward Distribution.	Heaps
109	Compute the k closest stars	Heaps
110	Compute the k largest elements in a max-heap	Heaps
111	Compute the median of online data	Heaps
112	Sort an almost-sorted array	Heaps
113	Sort an increasing-decreasing array	Heaps
114	Merge two sorted arrays	Heaps
115	Delete a node after index i in a linked-list	Linked lists
116	Remove the Kth last element from a list	Linked lists
117	Delete a node from a singly linked list	Linked lists
118	Test for overlapping lists. Lists are cycle-free.	Linked lists
119	Implement even-odd merge	Linked lists
120	Insert a node into a linked-list	Linked lists
121	Add list-based integers	Linked lists
122	Test for cyclicity	Linked lists
123	Test whether a singly linked list is palindromic	Linked lists
124	Implement cyclic right shift for singly linked lists	Linked lists
125	Remove duplicates from a sorted list	Linked lists
126	Reverse a single sublist	Linked lists
127	Bootcamp: Linked Lists	Linked lists
128	Merge two sorted lists	Linked lists
129	Implement list zipping	Linked lists
130	Find the closest integer with same weight.	Primitive types
131	Count Set Bits.	Primitive types
132	Check if a decimal integer is a palindrome	Primitive types
133	Computing the parity of a word	Primitive types
134	Compute x^y	Primitive types
135	Compute x/y	Primitive types
136	Compute x * y without arithmetical operators	Primitive types
137	Rectangle intersection	Primitive types
138	Reverse bits	Primitive types
139	Reverse digits	Primitive types
140	Swap bits	Primitive types
141	Generate all subsets of size k.	Recursion
142	Defective Jugs	Recursion
143	Generate strings of matched parens	Recursion
144	Generate palindromic decompositions	Recursion
145	Generate binary trees	Recursion
146	Equal subset sum partition	Recursion
147	Greatest common divisor	Recursion
148	Compute a Gray code	Recursion
149	The Towers of Hanoi problem	Recursion
150	Determine the critical height	Recursion
151	Generate all nonattacking placements of n-Queens	Recursion
152	Generate permutations	Recursion
153	Generate the power set	Recursion
154	Missing IP Address.	Searching
155	Binary Search	Searching
156	Find an element that appears only once	Searching
157	Find the duplicate and missing elements	Searching
158	Find the first missing positive entry	Searching
159	H-Index	Searching
160	Find first and last positions in array	Searching
161	Compute the integer square root	Searching
162	Find the kth largest element - large n, small k	Searching
163	Search in two sorted arrays	Searching
164	Find the kth largest element	Searching
165	Compute the real square root	Searching
166	Find the min and max simultaneously	Searching
167	Search in a 2D sorted array	Searching
168	Search a cyclically sorted array	Searching
169	Search a sorted array of unknown length	Searching
170	Bubble sort	Sorting
171	Calendar Rendering.	Sorting
172	Count Inversions	Sorting
173	Compute a salary threshold	Sorting
174	Heap sort	Sorting
175	Insertion sort	Sorting
176	Compute the intersection of two sorted arrays	Sorting
177	Merging intervals	Sorting
178	Compute the union of intervals	Sorting
179	Find K-th largest element in int array	Sorting
180	Remove first-name duplicates	Sorting
181	Implement a fast sorting algorithm for lists	Sorting
182	Merge two sorted arrays	Sorting
183	Normalize Pathnames	Stacks and queues
184	Evaluate RPN expressions	Stacks and queues
185	Test a string over {},(),[] for well-formedness	Stacks and queues
186	Compute the longest substring with matching parens	Stacks and queues
187	Compute the maximum of a sliding window	Stacks and queues
188	Compute buildings with a sunset view	Stacks and queues
189	Compute binary tree nodes in order of increasing depth	Stacks and queues
190	Number Base Convertion.	Strings
191	Implement Huffman coding	Strings
192	Test palindromicity	Strings
193	Justify text	Strings
194	Longest common substring	Strings
195	The look-and-say problem	Strings
196	Least String Rotation	Strings
197	Compute all mnemonics for a phone number	Strings
198	Search pattern in a string	Strings
199	Implement regular expression matching	Strings
200	Replace and remove	Strings
201	Reverse all the words in a sentence	Strings
202	Convert from Roman to decimal	Strings
203	Implement run-length encoding	Strings
204	Write a string sinusoidally	Strings
205	Compute the spreadsheet column encoding	Strings
206	Find the first occurrence of a substring	Strings
207	Compute all valid IP addresses	Strings