LeetCode Pattern: 18 Tips & Strategies for Solving Two-Pointers Problems (Including 8 Classic Problems & Solutions)

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In this comprehensive guide, we delve into the realm of Two Pointers problem-solving on LeetCode. From handling sorted arrays to dealing with duplicates, this guide provides a roadmap for mastering this LeetCode pattern.

I. TIPS & STRATEGIES FOR SOLVING TWO-POINTER PROBLEMS:

1. Understand Two-Pointer Problems:

1.1. Indicators of Two-Pointer Problems:

i. Array or List Manipulation:

• Two-pointer problems often involve manipulating elements in an array or list.

ii. Searching for a Pair:

• If the problem requires finding a pair of elements that satisfies certain conditions, two pointers might be used to scan the array.

iii. Searching for a Triplet:

• Problems asking for the existence of a triplet (or more elements) that satisfies certain conditions often involve the two-pointer approach.

iv. Sorting and Searching:

• Two-pointer problems are common when the array is sorted, and you need to search for elements, find pairs, or…