Pattern 2: Two Pointers Pattern
Two Pointers is a pattern where two pointers iterate through the data structure in tandem until one or both of the pointers hit a certain condition. Two Pointers is often useful when searching pairs in a sorted array or linked list; for example, when you have to compare each element of an array to its other elements.


How To Identify
- It will feature problems where you deal with sorted arrays (or Linked Lists) and need to find a set of elements that fulfill certain constraints
- The set of elements in the array is a pair, a triplet, or even a subarray

Questions
- Squaring a sorted array (easy)
- Triplets that sum to zero (medium)
- Comparing strings that contain backspaces (medium)

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