# Two pointers approach

#### 2022-06-14 23:06

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##### Algorithms:
#algorithm #two_pointers 
##### Data structures:
#array #linked_list 
##### Difficulty:
#CS_analysis #difficulty-
##### Related problems:
```expander
tag:#coding_problem tag:#two_pointers -tag:#template_remove_me 
```
 
- [[Leetcode Intersection-of-Two-Arrays-II]]
- [[Leetcode Merge-Sorted-Array]]
- [[Leetcode Merge-Two-Sorted-Lists]]
 

##### Links:
- [leetcode](https://leetcode.com/explore/learn/card/fun-with-arrays/511/in-place-operations/)
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### What is Two pointers approach?
By using two pointers, to in place modify array elements.
- One fast and one slow [[Leetcode Best-Time-To-Buy-And-Sell-Stock]] or [[Leetcode Linked-List-Cycle]]
- The two are unordered [[Leetcode Merge-Two-Sorted-Lists]]

### Why and when to use it?
- There are two arrays, or linked lists
- They are sorted, or operation in place will not interfere elements after.