Day 11 - 3-Sum Variant | Find All Triplets with Given Sum

Day 11 of the 100 Days DSA Question Series covers the 3-Sum Variant problem, an important question frequently asked in FAANG interviews. The goal is to find all unique triplets in an array that sum up to a given target. We will use an efficient Two-Pointer Technique to optimize the solution.

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Problem Name:
Find All Triplets with Given Sum in an Array | 3-Sum Variant

Platform:
FAANG-level interview preparation series

Approach: Two-Pointer Technique
Sort the Array → Helps in efficiently finding pairs using two-pointer technique.
Iterate through each element (nums[i]) and use two pointers:
Left pointer (l) at i+1
Right pointer (r) at the last index
Check the sum of nums[i] + nums[l] + nums[r]:
If the sum matches the target → Store the triplet.
If the sum is less than target → Move the l pointer forward.
If the sum is greater than target → Move the r pointer backward.
Avoid duplicates by skipping duplicate elements.

Видео Day 11 - 3-Sum Variant | Find All Triplets with Given Sum канала JK Coding Pathshala