Problem | Reason | Reference |
Moving Zeroes Sort Colors |
Corner cases | |
Shortest Word Distance | Thought: 2 ptr chasing | |
Merge 2 sorted Lists Remove Linked List Elem |
Corner cases | |
Power of Four | Thought: fun bit ops | |
Pow(x, n) | int overflow | |
Rectangle Area | Thought | |
Merge Sorted Array | Thought: from the back | |
Count Primes | Corner cases | |
First Bad Version | Corner cases | |
Rotate Array | Thought: Multiple solutions | |
Counting Bits | Thought: Fun DP | |
Top K Frequent Elements | Thought: BUCKETING! | |
Isomorphic Strings | Thought: note - bidirectional | |
Excel Sheet Column Title | Thought: list first several cases | |
Bulb Switcher | Math\Brainteaser | |
Word Pattern | Corner case | |
Majority Number | Thought: counting strategy | More thoughts |
Add Digits | Math, or by samples | LC Forum |
Power of 3 | Math | LC Forum |
Factorial Trailing Zeros | Math\counting | |
Generate Parentheses | DFS fun | |
Longest Inc Path in Matrix | DFS + Memorized Search | |
Binary Tree Inorder Traversal | DFS->Iterative | LC Forum |
Reverse Words in a String | Note the copy trick! | LC Forum |
House Robber | DP: fun ! | |
Paint Fence | DP: fun ! | |
Binary Search Tree Iterator | Stack\Iterator | |
Count Numbers with Unique Digits | Math: Combinatorics | |
Combinations | Note the backtracking one | |
Min Stack | Stack. Fun | |
Integer Break | DP, and Math | |
strStr() | *KMP algo. |
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