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Cracking the Coding Interview

Section Question Solution Difficulty Great Problem
1.1 Is Unique Solution Easy *
1.3 URLify Solution Easy *
1.4 Palindrome Permutation Solution Easy *
1.5 One Away Solution Medium *
1.9 String Rotation Solution Easy
2.1 Remove Dups Solution Easy *
2.4 Partition Solution Medium *
3 - Intro Implement a Stack Solution Easy *
3 - Intro Implement a Queue Solution Easy *
3.1 Three in One Solution Medium
3.2 Stack Min Solution Medium *
3.4 Queue via Stacks Solution Medium *
3.5 Sort Stack Solution Medium *
4 - Intro Implement a TreeNode Solution Easy *
4 - Intro Implement a GraphNode Solution Easy *
4 - Intro Breadth-First Search (BFS) Solution Medium *
4 - Intro Depth-First Search (DFS) Solution Medium *
4.01 Route Between Nodes Solution Easy *
4.05 Validate BST Solution Medium *
4.06 Successor Solution Medium *
4.07 Build Order Solution Hard *
4.09 BST Sequences Solution Hard
4.10 Check Subtree Solution Medium
4.11 Random Node Solution Hard *
5 - Intro BitFunctions: getBit Solution Easy
5 - Intro BitFunctions: setBit Solution Easy
5 - Intro BitFunctions: clearBit Solution Easy
5.2 Binary to String Solution Medium
5.3 Flip Bit to Win Solution Medium
5.4 Next Number Solution Hard
5.6 Conversion Solution Easy
5.7 Pairwise Swap Solution Medium
6 - Intro Prime - isPrime Solution Easy
6 - Intro Prime - generate Primes Solution Medium
7.09 Circular Array Solution Medium *
8.02 Robot in a Grid Solution Hard
8.03 Magic Index Solution Medium *
8.05 Recursive Multiply Solution Medium *
8.06 Towers of Hanoi Solution Hard *
8.13 Stack of Boxes Solution Hard *
10 - Intro Merge Sort Solution Hard *
10 - Intro Quick Sort Solution Hard *
10.01 Sorted Merge Solution Easy
10.04 Sorted Search No Size Solution Medium *
10.06 Sort Big File Solution Medium *
10.07 Missing Int Solution Hard
10.08 Find Duplicates Solution Easy *
10.10 Rank from Stream Solution Hard *
10.11 Peaks and Valleys Solution Easy *
13.5 TreeMap, HashMap, LinkedHashMap Solution Easy *
16.01 Number Swapper Solution Medium
16.04 Tic Tac Win Solution Medium *
16.06 Smallest Difference Solution Medium *
16.10 Living People Solution Medium *
16.11 Diving Board Solution Easy *
16.14 Best Line Solution Hard *
16.15 Master Mind Solution Medium
16.18 Pattern Matching Solution Hard *
16.19 Pond Sizes Solution Medium *
16.20 T9 Solution Medium *
16.21 Sum Swap Solution Medium *
16.22 Langtons Ant Solution Easy *
17.03 Random Set Solution Hard *
17.07 Baby Names Solution Easy *
17.11 Word Distance Solution Medium *
17.12 BiNode Solution Hard *
17.14 Smallest K Solution Medium *
17.15 Longest Word Solution Hard *
17.16 The Masseuse Solution Medium *
17.18 Shortest Supersequence Solution Hard *
17.19 Missing Two Solution Medium *
17.23 Max Black Square Solution Hard *
17.24 Max Submatrix Solution Hard *

LeetCode

# Question Solution Difficulty Great Problem
1 Two Sum Solution Easy *
2 Add Two Numbers Solution Medium *
4 Median of Two Sorted Arrays Solution Hard *
5 Longest Palindromic Substring Solution Medium *
15 3sum Solution Medium *
16 3sum Closest Solution Medium *
17 Letter Combinations of a Phone Number Solution Medium *
19 Remove Nth Node From End of List Solution Medium *
20 Valid Parentheses Solution Easy *
21 Merge Two Sorted Lists Solution Easy *
22 Generate Parentheses Solution Medium *
23 Merge k Sorted Lists Solution Hard *
28 Implement strStr() Solution Easy *
42 Trapping Rain Water Solution Hard *
46 Permutations Solution Medium *
47 Permutations II Solution Medium *
48 Rotate Image Solution Medium *
49 Group Anagrams Solution Medium *
51 N-Queens Solution Hard *
53 Maximum Subarray Solution Easy *
55 Jump Game Solution Medium *
62 Unique Paths Solution Medium *
63 Unique Paths II Solution Medium *
70 Climbing Stairs Solution Easy *
73 Set Matrix Zeroes Solution Medium *
78 Subsets Solution Medium *
81 Search in Rotated Sorted Array II Solution Medium *
90 Subsets II Solution Medium *
92 Reverse Linked List II Solution Medium *
94 Binary Tree Inorder Traversal Solution Medium *
98 Validate Binary Search Tree Solution Medium *
102 Binary Tree Level Order Traversal Solution Medium *
104 Maximum Depth of Binary Tree Solution Easy *
108 Convert Sorted Array to Binary Search Tree Solution Easy *
110 Balanced Binary Tree Solution Easy *
127 Word Ladder Solution Medium *
136 Single Number Solution Easy *
141 Linked List Cycle Solution Easy *
142 Linked List Cycle II Solution Medium *
143 Reorder List Solution Medium *
144 Binary Tree Preorder Traversal Solution Medium *
145 Binary Tree Postorder Traversal Solution Hard *
146 LRU Cache Solution Medium *
151 Reverse Words in a String Solution Medium *
160 Intersection of Two linked Lists Solution Easy *
162 Find Peak Element Solution Medium *
169 Majority Element Solution Easy *
172 Factorial Trailing Zeroes Solution Easy *
189 Rotate Array Solution Easy *
200 Number of Islands Solution Medium *
206 Reverse Linked List Solution Easy *
208 Implement Trie (Prefix Tree) Solution Medium *
231 Power of Two Solution Easy *
234 Palindrome Linked List Solution Easy *
235 Lowest Common Ancestor of a Binary Search Tree Solution Easy *
236 Lowest Common Ancestor of a Binary Tree Solution Medium *
237 Delete Node in a Linked List Solution Easy *
240 Search a 2D Matrix II Solution Medium *
242 Valid Anagram Solution Easy *
264 Ugly Number II Solution Medium *
268 Missing Number Solution Easy *
273 Integer to English Words Solution Hard *
290 Word Pattern Solution Easy *
295 Find Median from Data Stream Solution Hard *
300 Longest Increasing Subsequence Solution Medium *
347 Top K Frequent Elements Solution Medium *
371 Sum of Two Integers Solution Easy *
380 Insert Delete GetRandom O(1) Solution Medium *
381 Insert Delete GetRandom O(1) - Duplicates allowed Solution Hard *
383 Ransom Note Solution Easy *
384 Shuffle an Array Solution Medium *
437 Path Sum III Solution Easy *
443 String Compression Solution Easy *
445 Add Two Numbers II Solution Medium *
454 4Sum II Solution Medium *
470 Implement Rand10() Using Rand7() Solution Medium *
509 Fibonacci Number Solution Easy *
516 Longest Palindromic Subsequence Solution Medium *
518 Coin Change 2 Solution Medium *
525 Contiguous Array Solution Medium *
560 Subarray Sum Equals K Solution Medium *
581 Shortest Unsorted Continuous Subarray Solution Easy *
692 Top K Frequent Words Solution Medium *
695 Max Area of Island Solution Medium *
703 Kth Largest Element in a Stream Solution Easy *
704 Binary Search Solution Easy *
706 Design HashMap Solution Easy *
707 Design Linked List Solution Easy *
733 Flood Fill Solution Easy *
976 Largest Perimeter Triangle Solution Easy *
1010 Pairs of Songs With Total Durations Divisible by 60 Solution Easy *

LeetFree

# Question Solution Difficulty Great Problem
694 Number of Distinct Islands Solution Medium *
711 Number of Distinct Islands II Solution Hard

HackerRank

Question Solution Difficulty Great Problem
Linked List - Print in Reverse Solution Easy *
Counting Sort Solution Medium *
Reverse a Doubly Linked List Solution Medium *
Java 1D Array Solution Medium *
Java Dequeue Solution Medium *
Contacts Solution Hard *
Array Manipulation Solution Hard *
Electronics Shop Solution Easy
Minimum Distances Solution Easy
Find Digits Solution Easy
Picking Numbers Solution Easy
Sansa and XOR Solution Easy
Making Anagrams Solution Medium
Repeated String Solution Medium
Inserting a Node Into a Sorted Doubly Linked List Solution Medium
Super Reduced String Solution Medium
Caesar Cipher Solution Medium
Gemstones Solution Medium
Maximizing XOR Solution Medium
Sum vs XOR Solution Hard

Custom

Question Solution Difficulty Great Problem
Dijkstra's Algorithm Solution Hard *
Arithmetic Progression Missing Element Solution Easy
Shortest Common SuperSequence Solution Hard
Vanished Punctuation Solution Medium
2 Coins on Graph Solution Medium
Find Cycles in Graph Solution Medium
Shortest Cycle in Graph Containing Given Node Solution Medium
Risky Edges in Graph Solution Medium
Number of Shortest Paths Solution Medium
Ethnographers Births and Deaths Solution Medium
Adding and Removing Edges in MSTs Solution Medium

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