LeetCode Potential Thought Pitfalls

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.