Two Pointers Problems in Leetcode

 1.Running from both ends of an array

 - 2 Sum problem

Two Sum II - Input array is sorted - LeetCode

3Sum - LeetCode

4Sum - LeetCode

Number of Subsequences That Satisfy the Given Sum Condition - LeetCode

Two Sum IV - Input is a BST - LeetCode

Sum of Square Numbers - LeetCode

Boats to Save People - LeetCode

Minimize Maximum Pair Sum in Array - LeetCode

3Sum With Multiplicity - LeetCode

 - Trapping Water 
Container With Most Water - LeetCode

Trapping Rain Water - LeetCode

 - Next Permutation

Next Permutation - LeetCode

Next Greater Element III - LeetCode

Minimum Adjacent Swaps to Reach the Kth Smallest Number - LeetCode

 - Reversing / Swapping

Valid Palindrome - LeetCode

Reverse String - LeetCode

Reverse Vowels of a String - LeetCode

Valid Palindrome II - LeetCode

Reverse Only Letters - LeetCode

Remove Element - LeetCode

Sort Colors - LeetCode

Flipping an Image - LeetCode

Squares of a Sorted Array - LeetCode

Sort Array By Parity - LeetCode

Sort Array By Parity II - LeetCode

Pancake Sorting - LeetCode

Reverse Prefix of Word - LeetCode

Reverse String II - LeetCode

Reverse Words in a String - LeetCode

Reverse Words in a String III - LeetCode

 - Others

Bag of Tokens - LeetCode

DI String Match - LeetCode

Minimum Length of String After Deleting Similar Ends - LeetCode

Sentence Similarity III - LeetCode

Find K Closest Elements - LeetCode

Shortest Distance to a Character - LeetCode

2.Slow & Fast Pointers

 

 

 - Linked List Operations

Linked List Cycle - LeetCode

Linked List Cycle II - LeetCode

Remove Nth Node From End of List - LeetCode

Rotate List - LeetCode

Reorder List - LeetCode

Palindrome Linked List - LeetCode

 - Cyclic Detection

Find the Duplicate Number - LeetCode

Circular Array Loop - LeetCode

 - Sliding Window Like

Number of Subarrays with Bounded Maximum - LeetCode

Find K-th Smallest Pair Distance - LeetCode

Moving Stones Until Consecutive II - LeetCode

Count Pairs Of Nodes - LeetCode

Count Binary Substrings - LeetCode

K-diff Pairs in an Array - LeetCode

 - Rotation

Rotating the Box - LeetCode

Rotate Array - LeetCode

 - String

String Compression - LeetCode

Last Substring in Lexicographical Order - LeetCode

 - Remove Duplicate

Remove Duplicates from Sorted Array - LeetCode

Remove Duplicates from Sorted Array II - LeetCode

Remove Duplicates from Sorted List II - LeetCode

Duplicate Zeros - LeetCode

 - Others

Statistics from a Large Sample - LeetCode

Partition Labels - LeetCode

Magical String - LeetCode

Friends Of Appropriate Ages - LeetCode

Longest Mountain in Array - LeetCode

Shortest Subarray to be Removed to Make Array Sorted - LeetCode

3.Running from beginning of 2 arrays / Merging 2 arrays

  - Sorted arrays

Merge Sorted Array - LeetCode

Heaters - LeetCode

Find the Distance Value Between Two Arrays - LeetCode

 - Intersection / LCA like

Intersection of Two Linked Lists - LeetCode 

Intersection of Two Arrays - LeetCode

Intersection of Two Arrays II - LeetCode

 - Sub String

Implement strStr() - LeetCode

Longest Word in Dictionary through Deleting - LeetCode

Long Pressed Name - LeetCode

Longest Uncommon Subsequence II - LeetCode

Compare Version Numbers - LeetCode

Camelcase Matching - LeetCode

Expressive Words - LeetCode

 - Median Finder

Find Median from Data Stream - LeetCode

 - Meet-in-the-middle / Binary Search

Partition Array Into Two Arrays to Minimize Sum Difference - LeetCode

Closest Subsequence Sum - LeetCode

Ways to Split Array Into Three Subarrays - LeetCode

3Sum Closest - LeetCode

Valid Triangle Number - LeetCode

 - Others

Shortest Unsorted Continuous Subarray - LeetCode

Most Profit Assigning Work - LeetCode

Largest Merge Of Two Strings - LeetCode

Swap Adjacent in LR String - LeetCode

4.Split & Merge of an array / Divide & Conquer

 

 - Partition 

Partition List - LeetCode

 - Sorting

Sort List - LeetCode