LetsCode·Solving Leetcode Problems by Pattern

All questions are solved by patterns, and the learning sequence is listed below.

• Check my YouTube for all questions (https://www.youtube.com/@letscode1000)
• Rating for all questions from (https://zerotrac.github.io/leetcode_problem_rating/#/)
• Practice with ratings (https://huxulm.github.io/lc-rating/zen)

Top Coding Patterns

• 1 Hash

  • 1.1 Hash Table

    • 1.1.1 Two sum(16)

      • 1. Two Sum
      • 1512. Number of Good Pairs
      • 2815. Max Pair Sum in an Array
      • 2748. Number of Beautiful Pairs
      • 219. Contains Duplicate II
      • 121. Best Time to Buy and Sell Stock
      • 2342. Max Sum of a Pair With Equal Sum of Digits
      • 1010. Pairs of Songs With Total Durations Divisible by 60
      • 3185. Count Pairs That Form a Complete Day II
      • 454. 4Sum II
      • 2874. Maximum Value of an Ordered Triplet II
      • 1014. Best Sightseeing Pair
      • 1214. Two Sum BSTs
      • 2971. Find Polygon With the Largest Perimeter
      • 1679. Max Number of K-Sum Pairs
      • 2964. Number of Divisible Triplet Sums

  • 1.2 Counter

  • 1.3 Hash Set

• 2 Matrix

• 3 Stack

  • 3.1 basics

    • 1441. Build an Array With Stack Operations 1180
    • 844. Backspace String Compare 1228
    • 682. Baseball Game 1250
    • 2390. Removing Stars From a String 1348
    • 1472. Design Browser History 1454
    • 946. Validate Stack Sequences 1462
    • 71. Simplify Path 1500

• 4 Queue

• 5 Heap

  • Basics

  • Two Heaps

  • Regret greedy

• 6 Binary Search

  • 6.1 Basics

    • 34. Find First and Last Position of Element in Sorted Array
    • 35. Search Insert Position
    • 704. Binary Search
    • 744. Find Smallest Letter Greater Than Target
    • 2529. Maximum Count of Positive Integer and Negative Integer
    • 1385. Find the Distance Value Between Two Arrays
    • 2300. Successful Pairs of Spells and Potions
    • 2389. Longest Subsequence With Limited Sum
    • 2080. Range Frequency Queries
    • 2563. Count the Number of Fair Pairs
    • 2856. Minimum Array Length After Pair Removals
    • 243. Shortest Word Distance
    • 244. Shortest Word Distance II
    • 245. Shortest Word Distance III
    • 374. Guess Number Higher or Lower
    • 1182. Shortest Distance to Target Color

  • 6.2 Binary Search Answer

    • 6.2.1 Minimum value(10)

      • 1283. Find the Smallest Divisor Given a Threshold
      • 2187. Minimum Time to Complete Trips
      • 1870. Minimum Speed to Arrive on Time
      • 1011. Capacity To Ship Packages Within D Days
      • 875. Koko Eating Bananas
      • 475. Heaters
      • 2594. Minimum Time to Repair Cars
      • 1482. Minimum Number of Days to Make m Bouquets
      • 2604. Minimum Time to Eat All Grains
      • 2702. Minimum Operations to Make Numbers Non-positive

    • 6.2.2 Maximum Value

      • 274. H-Index
      • 275. H-Index II
      • 2226. Maximum Candies Allocated to K Children
      • 1898. Maximum Number of Removable Characters
      • 1642. Furthest Building You Can Reach
      • 2861. Maximum Number of Alloys
      • 2258. Escape the Spreading Fire
      • 1891. Cutting Ribbons

    • 6.2.3 minimize max value

      • 410. Split Array Largest Sum
      • 2064. Minimized Maximum of Products Distributed to Any Store
      • 1760. Minimum Limit of Balls in a Bag
      • 1631. Path With Minimum Effort
      • 2439. Minimize Maximum of Array
      • 2560. House Robber IV
      • 778. Swim in Rising Water
      • 2616. Minimize the Maximum Difference of Pairs

    • 6.2.4 maximize min value

      • 1552. Magnetic Force Between Two Balls
      • 2517. Maximum Tastiness of Candy Basket
      • 2812. Find the Safest Path in a Grid
      • 1102. Path With Maximum Minimum Value
      • 1231. Divide Chocolate
      • 2528. Maximize the Minimum Powered City

    • 6.2.5 kth smallest/largest

      • 378. Kth Smallest Element in a Sorted Matrix
      • 668. Kth Smallest Number in Multiplication Table
      • 373. Find K Pairs with Smallest Sums
      • 1201. Ugly Number III
      • 2702. Minimum Operations to Make Numbers Non-positive

• 7 Two Pointers

  • 7.1 Basics

  • 7.2 Fast Slow Pointers

  • 7.3 Three Pointers

  • 7.4 List Groups(47)

    • 1446. Consecutive Characters

    • 1869. Longer Contiguous Segments of Ones than Zeros

    • 1957. Delete Characters to Make Fancy String

    • 2414. Length of the Longest Alphabetical Continuous Substring

    • 674. Longest Continuous Increasing Subsequence

    • 978. Longest Turbulent Subarray

    • 2110. Number of Smooth Descent Periods of a Stock

    • 228. Summary Ranges

    • 2760. Longest Even Odd Subarray With Threshold