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AI Features

CIP Part 2 C#

1.Two Pointers

K-diff Pairs in an Array Solution: K-diff Pairs in an Array Longest Mountain in Array Solution: Longest Mountain in Array Meeting Scheduler Solution: Meeting Scheduler Maximize Greatness of an Array Solution: Maximize Greatness of an Array Find the Original Typed String I Solution: Find the Original Typed String I Remove Duplicates from Sorted List II Solution: Remove Duplicates from Sorted List II Count the Number of Fair Pairs Solution: Count the Number of Fair Pairs Sum of Square Numbers Solution: Sum of Square Numbers Find Beautiful Indices in the Given Array II Solution: Find Beautiful Indices in the Given Array II Number of Subsequences That Satisfy the Given Sum Condition Solution: Number of Subsequences That Satisfy the Given Sum Condi Zigzag Iterator Solution: Zigzag Iterator Length of Last Word Solution: Length of Last Word

2.Fast and Slow Pointers

3.Sliding Window

Longest Substring with At Most K Distinct Characters Solution: Longest Substring with At Most K Distinct Characters Maximum Points You Can Obtain from Cards Solution: Maximum Points You Can Obtain from Cards Minimum Swaps to Group All 1's Together II Solution: Minimum Swaps to Group All 1's Together II Maximum Number of Occurrences of a Substring Solution: Maximum Number of Occurrences of a Substring Count Number of Nice Subarrays Solution: Count Number of Nice Subarrays Maximum Erasure Value Solution: Maximum Erasure Value Maximum Sum of Distinct Subarrays With Length K Solution: Maximum Sum of Distinct Subarrays With Length K Longest Nice Subarray Solution: Longest Nice Subarray Count Vowel Substrings of a String Solution: Count Vowel Substrings of a String Reschedule Meetings for Maximum Free Time I Solution: Reschedule Meetings for Maximum Free Time I Grumpy Bookstore Owner Solution: Grumpy Bookstore Owner Longest Strictly Increasing or Strictly Decreasing Subarray Solution: Longest Strictly Increasing or Strictly Decreasing Suba

4.Intervals

5.In-Place Manipulation of a Linked List

6.Heaps

Sort Characters By Frequency Solution: Sort Characters By Frequency Furthest Building You Can Reach Solution: Furthest Building You Can Reach Trapping Rain Water II Solution: Trapping Rain Water II Maximum Number of Events That Can Be Attended Solution: Maximum Number of Events That Can Be Attended Single-Threaded CPU Solution: Single-Threaded CPU Hand of Straights Solution: Hand of Straights Last Stone Weight Solution: Last Stone Weight

7.K-way merge

8.Top K Elements

9.Modified Binary Search

Search a 2D Matrix Solution: Search a 2D Matrix Find the Smallest Divisor Given a Threshold Solution: Find the Smallest Divisor Given a Threshold Zero Array Transformation II Solution: Zero Array Transformation II House Robber IV Solution: House Robber IV Minimum Number of Days to Make m Bouquets Solution: Minimum Number of Days to Make m Bouquets Valid Perfect Square Solution: Valid Perfect Square Peak Index in a Mountain Array Solution: Peak Index in a Mountain Array

10.Subsets

11.Greedy Techniques

Minimum Adjacent Swaps to Make a Valid Array Solution: Minimum Adjacent Swaps to Make a Valid Array Special Binary String Solution: Special Binary String Maximize Distance to Closest Person Solution: Maximize Distance to Closest Person Minimum Number of Taps to Open to Water a Garden Solution: Minimum Number of Taps to Open to Water a Garden Valid Parenthesis String Solution: Valid Parenthesis String Minimum Number of Swaps to Make the String Balanced Solution: Minimum Number of Swaps to Make the String Balanced Minimum Number of Arrows to Burst Balloons Solution: Minimum Number of Arrows to Burst Balloons Minimum Increment to Make Array Unique Solution: Minimum Increment to Make Array Unique Zero Array Transformation III Solution: Zero Array Transformation III

12.Backtracking

Combination Sum II Solution: Combination Sum II

13.Dynamic Programming

Minimum Cost For Tickets Solution: Minimum Cost For Tickets Count Palindromic Subsequences Solution: Count Palindromic Subsequences Unique Paths II Solution: Unique Paths II Best Time to Buy and Sell Stock IV Solution: Best Time to Buy and Sell Stock IV Delete and Earn Solution: Delete and Earn Longest String Chain Solution: Longest String Chain Last Stone Weight II Solution: Last Stone Weight II Stickers to Spell Word Solution: Stickers to Spell Word New 21 Game Solution: New 21 Game Odd Even Jump Solution: Odd Even Jump 2 Keys Keyboard Solution: 2 Keys Keyboard Minimum Cost to Cut a Stick Solution: Minimum Cost to Cut a Stick Domino and Tromino Tiling Solution: Domino and Tromino Tiling Maximum Number of Events That Can Be Attended II Solution: Maximum Number of Events That Can Be Attended II Scramble String Solution: Scramble String Minimum Falling Path Sum Solution: Minimum Falling Path Sum Find the Minimum Amount of Time to Brew Potions Solution: Find the Minimum Amount of Time to Brew Potions Target Sum Solution: Target Sum Maximum Sum Circular Subarray Solution: Maximum Sum Circular Subarray Coin Change II Solution: Coin Change II Maximum Sum of 3 Non-Overlapping Subarrays Solution: Maximum Sum of 3 Non-Overlapping Subarrays Ugly Number II Solution: Ugly Number II Longest Palindromic Subsequence Solution: Longest Palindromic Subsequence Different Ways to Add Parentheses Solution: Different Ways to Add Parentheses Best Time to Buy and Sell Stock with Transaction Fee Solution: Best Time to Buy and Sell Stock with Transaction Fee Minimum Operations to Reduce an Integer to 0 Solution: Minimum Operations to Reduce an Integer to 0

14.Cyclic Sort

15.Topological Sort

16.Sort and Search

Minimum Absolute Difference Solution: Minimum Absolute Difference Most Profit Assigning Work Solution: Most Profit Assigning Work Rank Transform of an Array Solution: Rank Transform of an Array Relative Sort Array Solution: Relative Sort Array

17.Matrices

Search a 2D Matrix II Solution: Search a 2D Matrix II

18.Stacks

Next Greater Element II Solution: Next Greater Element II Sum of Subarray Minimums Solution: Sum of Subarray Minimums Car Fleet Solution: Car Fleet Clear Digits Solution: Clear Digits Remove All Occurrences of a Substring Solution: Remove All Occurrences of a Substring Subarray With Elements Greater Than Varying Threshold Solution: Subarray With Elements Greater Than Varying Threshold 132 Pattern Solution: 132 Pattern Sum of Subarray Ranges Solution: Sum of Subarray Ranges Add Two Numbers II Solution: Add Two Numbers II Reverse Substrings Between Each Pair of Parentheses Solution: Reverse Substrings Between Each Pair of Parentheses Maximum Nesting Depth of the Parentheses Solution: Maximum Nesting Depth of the Parentheses Final Prices With a Special Discount in a Shop Solution: Final Prices With a Special Discount in a Shop Minimum Add to Make Parentheses Valid Solution: Minimum Add to Make Parentheses Valid

19.Graphs

Walls and Gates Solution: Walls and Gates Snakes and Ladders Solution: Snakes and Ladders The Maze Solution: The Maze Shortest Path in Binary Matrix Solution: Shortest Path in Binary Matrix All Nodes Distance K in Binary Tree Solution: All Nodes Distance K in Binary Tree Making A Large Island Solution: Making A Large Island Minimum Edge Reversals So Every Node Is Reachable Solution: Minimum Edge Reversals So Every Node Is Reachable Minimum Knight Moves Solution: Minimum Knight Moves Keys and Rooms Solution: Keys and Rooms Is Graph Bipartite?Solution: Is Graph Bipartite?Possible Bipartition Solution: Possible Bipartition Divide Nodes Into the Maximum Number of Groups Solution: Divide Nodes Into the Maximum Number of Groups Min Cost to Connect All Points Solution: Min Cost to Connect All Points

20.Tree Depth-First Search

Path Sum III Solution: Path Sum III Boundary of Binary Tree Solution: Boundary of Binary Tree Convert Sorted List to Binary Search Tree Solution: Convert Sorted List to Binary Search Tree Sum Root to Leaf Numbers Solution: Sum Root to Leaf Numbers Count Complete Tree Nodes Solution: Count Complete Tree Nodes Nested List Weight Sum Solution: Nested List Weight Sum Binary Tree Postorder Traversal Solution: Binary Tree Postorder Traversal

21.Tree Breadth-First Search

Binary Tree Vertical Order Traversal Solution: Binary Tree Vertical Order Traversal Maximum Width of Binary Tree Solution: Maximum Width of Binary Tree Cousins in Binary Tree Solution: Cousins in Binary Tree Cousins in Binary Tree Solution: Cousins in Binary Tree Minimum Depth of Binary Tree Solution: Minimum Depth of Binary Tree Populating Next Right Pointers in Each Node II Solution: Populating Next Right Pointers in Each Node II Find Largest Value in Each Tree Row Solution: Find Largest Value in Each Tree Row

22.Trie

23.Hash Maps

Make Array Zero by Subtracting Equal Amounts Solution: Make Array Zero by Subtracting Equal Amounts Find Common Characters Solution: Find Common Characters Count Servers that Communicate Solution: Count Servers that Communicate Check If N and Its Double Exist Solution: Check If N and Its Double Exist Check If Array Pairs Are Divisible by k Solution: Check If Array Pairs Are Divisible by k Rabbits in Forest Solution: Rabbits in Forest Max Sum of a Pair With Equal Sum of Digits Solution: Max Sum of a Pair With Equal Sum of Digits Longest Harmonious Subsequence Solution: Longest Harmonious Subsequence Finding 3-Digit Even Numbers Solution: Finding 3-Digit Even Numbers Subarray Sums Divisible by K Solution: Subarray Sums Divisible by K Number of Black Blocks Solution: Number of Black Blocks Minimum Number of Steps to Make Two Strings Anagram Solution: Minimum Number of Steps to Make Two Strings Anagram Degree of an Array Solution: Degree of an Array Make Sum Divisible by P Solution: Make Sum Divisible by P Find the Prefix Common Array of Two Arrays Solution: Find the Prefix Common Array of Two Arrays Find Missing and Repeated Values Solution: Find Missing and Repeated Values Number of Divisible Triplet Sums Solution: Number of Divisible Triplet Sums Number of Matching Subsequences Solution: Number of Matching Subsequences

24.Knowing What to Track

Minimum Operations to Write the Letter Y on a Grid Solution: Minimum Operations to Write the Letter Y on a Grid Unique Length-3 Palindromic Subsequences Solution: Unique Length-3 Palindromic Subsequences Shortest Palindrome Solution: Shortest Palindrome Find the Celebrity Solution: Find the Celebrity Kids With the Greatest Number of Candies Solution: Kids With the Greatest Number of Candies Fruits Into Baskets II Solution: Fruits Into Baskets II Number of Good Pairs Solution: Number of Good Pairs Maximum Product of Three Numbers Solution: Maximum Product of Three Numbers Remove Outermost Parentheses Solution: Remove Outermost Parentheses Max Chunks To Make Sorted Solution: Max Chunks To Make Sorted Count Vowel Strings in Ranges Solution: Count Vowel Strings in Ranges Shortest Subarray with Sum at Least K Solution: Shortest Subarray with Sum at Least K Word Subsets Solution: Word Subsets Find the Highest Altitude Solution: Find the Highest Altitude Summary Ranges Solution: Summary Ranges Special Array I Solution: Special Array I Number of Ways to Split Array Solution: Number of Ways to Split Array String Compression III Solution: String Compression III Find Longest Special Substring That Occurs Thrice I Solution: Find Longest Special Substring That Occurs Thrice I Guess the Word Solution: Guess the Word Best Sightseeing Pair Solution: Best Sightseeing Pair Shortest Unsorted Continuous Subarray Solution: Shortest Unsorted Continuous Subarray Bitwise ORs of Subarrays Solution: Bitwise ORs of Subarrays Check if Array Is Sorted and Rotated Solution: Check if Array Is Sorted and Rotated Valid Word Solution: Valid Word Running Sum of 1d Array Solution: Running Sum of 1d Array Find Numbers with Even Number of Digits Solution: Find Numbers with Even Number of Digits Maximum Difference Between Increasing Elements Solution: Maximum Difference Between Increasing Elements

25.Union Find

Power Grid Maintenance Solution: Power Grid Maintenance Number of Operations to Make Network Connected Solution: Number of Operations to Make Network Connected

26.Custom Data Structures

27.Bitwise Manipulation

Single Number III Solution: Single Number III Power of Four Solution: Power of Four

28.Math and Geometry

The kth Factor of n Solution: The kth Factor of n Find the Winner of the Circular Game Solution: Find the Winner of the Circular Game Build Array from Permutation Solution: Build Array from Permutation Minimum Moves to Equal Array Elements Solution: Minimum Moves to Equal Array Elements Angle Between Hands of a Clock Solution: Angle Between Hands of a Clock Type of Triangle Solution: Type of Triangle Convert Binary Number in a Linked List to Integer Solution: Convert Binary Number in a Linked List to Integer Count the Hidden Sequences Solution: Count the Hidden Sequences Find N Unique Integers Sum up to Zero Solution: Find N Unique Integers Sum up to Zero Excel Sheet Column Number Solution: Excel Sheet Column Number Water Bottles Solution: Water Bottles Excel Sheet Column Title Solution: Excel Sheet Column Title Ugly Number Solution: Ugly Number Reach a Number Solution: Reach a Number

Solution: Cousins in Binary Tree

C# solution for the Cousins in Binary Tree problem using the Tree Breadth-First Search pattern.

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Statement

Given the root of a binary tree root and two distinct values x and y, determine whether the nodes with values x and y are cousins.

Two nodes are considered cousins if they are at the same depth in the tree but have different parent nodes. Return true if the nodes are cousins, otherwise return false.

Note: The values x and y are guaranteed to appear somewhere in the tree.

Constraints:

The number of nodes in the tree is in the range $[2, 100]$ ...