Leetcode Problem Pattern

Summary

There are many excellent articles here that can solve multiple similar problems through a template. We have organized these resources in hopes of helping everyone.😄

Table

Post	Author	Can Solve Problems
Most consistent ways of dealing with the series of stock problems by fun4LeetCode	fun4LeetCode	121. Best Time to Buy and Sell Stock 122. Best Time to Buy and Sell Stock II 123. Best Time to Buy and Sell Stock III 188. Best Time to Buy and Sell Stock IV 309. Best Time to Buy and Sell Stock with Cooldown 714. Best Time to Buy and Sell Stock with Transaction Fee
General principles behind problems similar to "Reverse Pairs"	fun4LeetCode	493. Reverse Pairs 315. Count of Smaller Numbers After Self 327. Count of Range Sum
Summary of solutions for problems "reducible" to LeetCode 378	fun4LeetCode	378. Kth Smallest Element in a Sorted Matrix 373. Find K Pairs with Smallest Sums 378. Kth Smallest Element in a Sorted Matrix 668. Kth Smallest Number in Multiplication Table 719. Find K-th Smallest Pair Distance 786. K-th Smallest Prime Fraction
Approach the problem using the "trial and error" algorithm	fun4LeetCode	378. Kth Smallest Element in a Sorted Matrix 373. Find K Pairs with Smallest Sums 378. Kth Smallest Element in a Sorted Matrix 668. Kth Smallest Number in Multiplication Table 719. Find K-th Smallest Pair Distance 786. K-th Smallest Prime Fraction
Java/C++ O(N) solution using cyclic swapping	fun4LeetCode	765. Couples Holding Hands 268. Missing Number 41. First Missing Positive
[Python] Basic Calculator I, II, III easy solution, detailed explanation	DBabichev	224. Basic Calculator 227. Basic Calculator II 772. Basic Calculator III
Python 140ms beats 100%, and works for N-sum (N>=2)	zhuyinghua1203	18. 4Sum 1. Two Sum 15. 3Sum
Sum MegaPost - Python3 Solution with a detailed explanation	peyman_np	1. Two Sum 15. 3Sum 18. 4Sum 40. Combination Sum II
A comprehensive guide and template for monotonic stack based problems	darkalarm	503. Next Greater Element II 739. Daily Temperatures 1762. Buildings with an ocean view 456. Find 132 Pattern 42. Trapping rain water 84. Largest rectangle in histogram 1944. Number of visible people in the queue
A general approach to backtracking questions in Java (Subsets, Permutations, Combination Sum, Palind...	issac3	39. Combination Sum 78. Subsets 90. Subsets II 46. Permutations 47. Permutations II 40. Combination Sum II 131. Palindrome Partitioning
Preorder, Inorder and Postorder Traversal Iterative Java Solution	issac3	145. Binary Tree Postorder Traversal 144. Binary Tree Preorder Traversal 94. Binary Tree Inorder Traversal
Monotonic Queue Summary	luxy622	85. Maximal Rectangle 862. Shortest Subarray with Sum at Least K
[Python] Powerful Ultimate Binary Search Template. Solved many problems	zhijun_liao	278. First Bad Version 69. Sqrt(x) 35. Search Insert Position 1011. Capacity To Ship Packages Within D Days 410. Split Array Largest Sum etc.
[Python] Graph Algorithms One Place for quick revision	sharmapriyanka2690	743. Network Delay Time 1135. Connecting Cities With Minimum Cost 207. Course Schedule 547. Number of Provinces 785. Is Graph Bipartite?