notes/OJ notes/pages/Two pointers approach.md

Two pointers approach

2022-06-14 23:06

---

Algorithms:

#algorithm #two_pointers

Data structures:

#array #linked_list

Difficulty:

#CS_analysis #difficulty-

Related problems:

Links:

• leetcode

---

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.