Notes
Coding
Design PatternsAlgorithmic PatternSystem DesignAboutCoding
Coding
Design PatternsAlgorithmic PatternSystem DesignAboutCoding
  • About
  • Easy
    • 26. Remove Duplicates from Sorted Array
    • 88. Merge Sorted Array
    • 118. Pascal's Triangle
    • 121. Best Time to Buy and Sell Stock
    • 283. Move Zeroes
    • 345. Reverse Vowels of a String
    • 605. Can Place Flowers
    • 704. Binary Search
    • 1071. Greatest Common Divisor of Strings
    • 1431. Kids With the Greatest Number of Candies
    • 1752. Check if Array Is Sorted and Rotated
    • 1768. Merge Strings Alternately
    • 2965. Find Missing and Repeated Values
  • Medium
    • 2. Add Two Numbers
    • 3. Longest Substring Without Repeating Characters
    • 15. 3Sum
    • 22. Generate Parentheses
    • 53. Maximum Subarray
    • 54. Spiral Matrix
    • 56. Merge Intervals
    • 73. Set Matrix Zeroes
    • 74. Search a 2D Matrix
    • 75. Sort Colors
    • 78. Subsets
    • 151. Reverse Words in a String
    • 162. Find Peak Element
    • 169. Majority Element
    • 189. Rotate Array (Approach 1 )
      • 189. Rotate Array (Approach 2 )
    • 198. House Robber
    • 200. Number of Islands (Approach 1)
      • 200. Number of Islands (Approach 2)
    • 207. Course Schedule
    • 215. Kth Largest Element in an Array
    • 238. Product of Array Except Self
    • 253. Meeting Rooms II (Approach 1)
      • 253. Meeting Rooms II (Approach 2)
    • 560. Subarray Sum Equals K
    • 636. Exclusive Time of Functions
    • 2140. Solving Questions With Brainpower
    • 3169. Count Days Without Meetings
  • Hard
    • 26. Remove Duplicates from Sorted Array
    • 27. Remove Element
    • 42. Trapping Rain Water
    • 55. Jump Game
    • 80. Remove Duplicates from Sorted Array II
    • 88. Merge Sorted Array
    • 121. Best Time to Buy and Sell Stock
    • 122. Best Time to Buy and Sell Stock II
    • 189. Rotate Array
    • 274. H-Index
  • Template
  • Misc
    • Implement Upper Bound
    • Implement Lower Bound
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  1. Medium
  2. 200. Number of Islands (Approach 1)

200. Number of Islands (Approach 2)

Intuition

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