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Leetcode
  • Content
  • Algorithms
    • Linear Search
    • Binary Search
    • Counting Sort
    • Merge Sort
    • Insertion Sort
    • Selection Sort
  • Array and String
    • Introduction to Array
      • Introduction to Array
      • Introduction to Dynamic Array
      • Find Pivot Index
      • Largest Number At Least Twice of Others
      • Plus One
    • Introduction to 2D Array
      • Introduction to 2D Array
      • Diagonal Traverse
      • Spiral Matrix
      • Pascal's Triangle
    • Introduction to String
      • Introduction to String
      • Immutable String - Problems & Solutions
      • Add binary
      • Implement strStr()
      • Longest Common Prefix
    • Two-Pointer Technique
      • Two-pointer Technique - Scenario I
      • Reverse String
      • Array Partition I
      • Two Sum II - Input array is sorted
      • Two-pointer Technique - Scenario II
      • Remove Element
      • Max Consecutive Ones
      • Minimum Size Subarray Sum
    • Conclusion
      • Array-related Techniques
      • Rotate Array
      • Pascal's Triangle II
      • Reverse Words in a String
      • Reverse Words in a String III
      • Remove Duplicates from Sorted Array
      • Move Zeroes
  • Linked List
    • Singly Linked List
      • Introduction - Singly Linked List
      • Add Operation - Singly Linked List
      • Delete Operation - Singly Linked List
      • Design Linked List
    • Two Pointer Technique
      • Two-Pointer in Linked List
      • Linked List Cycle
      • Linked List Cycle II
      • Intersection of Two Linked Lists
      • Remove Nth Node From End of List
      • Summary - Two-Pointer in Linked List
  • Problems
    • 1. Two Sum
    • 2. Add Two Numbers
    • 7. Reverse Integer
    • 9. Palindrome Number
    • 11. Container With Most Water
    • 12. Integer to Roman
    • 13. Roman to Integer
    • 14. Longest Common Prefix
    • 15. 3Sum
    • 21. Merge Two Sorted Lists
    • 26. Remove Duplicates from Sorted Array
    • 27. Remove Element
    • 28. Find the Index of the First Occurrence in a String
    • 34. Find First and Last Position of Element in Sorted Array
    • 35. Search Insert Position
    • 43. Multiply Strings
    • 49. Group Anagrams
    • 50. Pow(x, n)
    • 54. Spiral Matrix
    • 58. Length of Last Word
    • 66. Plus One
    • 67. Add Binary
    • 69. Sqrt(x)
    • 73. Set Matrix Zeroes
    • 75. Sort Colors
    • 88. Merge Sorted Array
    • 104. Maximum Depth of Binary Tree
    • 121. Best Time to Buy and Sell Stock
    • 122. Best Time to Buy and Sell Stock II
    • 136. Single Number
    • 146. LRU Cache
    • 189. Rotate Array
    • 206. Reverse Linked List
    • 217. Contains Duplicate
    • 219. Cotains Duplicate II
    • 226. Invert Binary Tree
    • 238. Product of Array Except Self
    • 242. Valid Anagram
    • 268. Missing Number
    • 283. Move Zeroes
    • 350. Intersection of Two Arrays II
    • 383. Ransom Note
    • 389. Find the Difference
    • 412. Fizz Buzz
    • 414. Third Maximum Number
    • 445. Add Two Numbers II
    • 448. Find All Numbers Disappeared in an Array
    • 459. Repeated Substring Pattern
    • 485. Max Consecutive Ones
    • 509. Fibonacci Number
    • 637. Average of Levels in Binary Tree
    • 657. Robot Return to Origin
    • 682. Baseball Game
    • 704. Binary Search
    • 705. Design HashSet
    • 709. To Lower Case
    • 724. Find Pivot Index
    • 876. Middle of the Linked List
    • 896. Monotonic Array
    • 860. Lemonade Change
    • 905. Sort Array By Parity
    • 916. Word Subsets
    • 941. Valid Mountain Array
    • 976. Largest Perimeter Triangle
    • 977. Squares of a Sorted Array
    • 1041. Robot Bounded In Circle
    • 1051. Height Checker
    • 1089. Duplicate Zeros
    • 1232. Check If It Is a Straight Line
    • 1275. Find Winner on a Tic Tac Toe Game
    • 1295. Find Numbers with Even Number of Digits
    • 1299. Replace Elements with Greatest Element on Right Side
    • 1342. Number of Steps to Reduce a Number to Zero
    • 1346. Check If N and Its Double Exist
    • 1476. Subrectangle Queries
    • 1480. Running Sum of 1d Array
    • 1491. Average Salary Excluding the Minimum and Maximum Salary
    • 1502. Can Make Arithmetic Progression From Sequence
    • 1523. Count Odd Numbers in an Interval Range
    • 1572. Matrix Diagonal Sum
    • 1672. Richest Customer Wealth
    • 1768. Merge Strings Alternately
    • 1752. Check if Array Is Sorted and Rotated
    • 1769. Minimum Number of Operations to Move All Balls to Each Box
    • 1790. Check if One String Swap Can Make Strings Equal
    • 1800. Maximum Ascending Subarray Sum
    • 1822. Sign of the Product of an Array
    • 1930. Unique Length-3 Palindromic Subsequences
    • 1991. Find the Middle Index in Array
    • 2185. Counting Words With a Given Prefix
    • 2235. Add Two Integers
    • 2236. Root Equals Sum of Children
    • 2270. Number of Ways to Split Array
    • 2381. Shifting Letters II
    • 2559. Count Vowel Strings in Ranges
    • 2610. Convert an Array Into a 2D Array With Conditions
    • 2657. Find the Prefix Common Array of Two Arrays
    • 3042. Count Prefix and Suffix Pairs I
    • 3105. Longest Strictly Increasing or Strictly Decreasing Subarray
    • 3151. Special Array I
    • 3223. Minimum Length of String After Operations
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1. Two Sum
2. Add Two Numbers
7. Reverse Integer
9. Palindrome Number
11. Container With Most Water
12. Integer to Roman
13. Roman to Integer
14. Longest Common Prefix
15. 3Sum
21. Merge Two Sorted Lists
26. Remove Duplicates from Sorted Array
27. Remove Element
28. Find the Index of the First Occurrence in a String
34. Find First and Last Position of Element in Sorted Array
35. Search Insert Position
43. Multiply Strings
49. Group Anagrams
50. Pow(x, n)
54. Spiral Matrix
58. Length of Last Word
66. Plus One
67. Add Binary
69. Sqrt(x)
73. Set Matrix Zeroes
75. Sort Colors
88. Merge Sorted Array
104. Maximum Depth of Binary Tree
121. Best Time to Buy and Sell Stock
122. Best Time to Buy and Sell Stock II
136. Single Number
146. LRU Cache
189. Rotate Array
206. Reverse Linked List
217. Contains Duplicate
219. Contains Duplicate II
226. Invert Binary Tree
238. Product of Array Except Self
242. Valid Anagram
268. Missing Number
283. Move Zeroes
350. Intersection of Two Arrays II
383. Ransom Note
389. Find the Difference
412. Fizz Buzz
414. Third Maximum Number
445. Add Two Numbers II
448. Find All Numbers Disappeared in an Array
459. Repeated Substring Pattern
485. Max Consecutive Ones
509. Fibonacci Number
637. Average of Levels in Binary Tree
657. Robot Return to Origin
682. Baseball Game
704. Binary Search
705. Design HashSet
709. To Lower Case
724. Find Pivot Index
876. Middle of the Linked List
860. Lemonade Change
896. Monotonic Array
905. Sort Array By Parity
916. Word Subsets
941. Valid Mountain Array
976. Largest Perimeter Triangle
977. Squares of a Sorted Array
1041. Robot Bounded In Circle
1051. Height Checker
1089. Duplicate Zeros
1232. Check If It Is a Straight Line
1275. Find Winner on a Tic Tac Toe Game
1295. Find Numbers with Even Number of Digits
1299. Replace Elements with Greatest Element on Right Side
1342. Number of Steps to Reduce a Number to Zero
1346. Check If N and Its Double Exist
1476. Subrectangle Queries
1480. Running Sum of 1d Array
1491. Average Salary Excluding the Minimum and Maximum Salary
1502. Can Make Arithmetic Progression From Sequence
1523. Count Odd Numbers in an Interval Range
1572. Matrix Diagonal Sum
1672. Richest Customer Wealth
1752. Check if Array Is Sorted and Rotated
1768. Merge Strings Alternately
1769. Minimum Number of Operations to Move All Balls to Each Box
1790. Check if One String Swap Can Make Strings Equal
1800. Maximum Ascending Subarray Sum
1822. Sign of the Product of an Array
1930. Unique Length-3 Palindromic Subsequences
1991. Find the Middle Index in Array
2185. Counting Words With a Given Prefix
2235. Add Two Integers
2236. Root Equals Sum of Children
2270. Number of Ways to Split Array
2381. Shifting Letters II
2559. Count Vowel Strings in Ranges
2610. Convert an Array Into a 2D Array With Conditions
2657. Find the Prefix Common Array of Two Arrays
3042. Count Prefix and Suffix Pairs I
3105. Longest Strictly Increasing or Strictly Decreasing Subarray
3151. Special Array I
3223. Minimum Length of String After Operations