Instead of checking all possible triplets using three loops, it reduces the search space by adjusting two pointers (left and right) while iterating through the array. The naive approach involves exploring all subsets of size three and calculating their sums to determine the closest to the target. The problem is a standard variation of the 3SUM problem, where instead of looking for numbers whose sum is 0, we look for numbers whose sum is any constant `C`. This enables controlled pointer movements to adjust sum values toward the target. /** Triplet Sum Close to Target (medium) Given an array of unsorted numbers and a target number, find a triplet in the array whose sum is as close to the target number as possible, return the sum of the triplet. If the sum of the two numbers pointed by the two pointers is smaller than the target sum, this means that we need a pair with a larger sum. Can you solve this real interview question? 3Sum Closest - Given an integer array nums of length n and an integer target, find three integers at distinct indices in nums such that the sum is closest to target. 4. The difference between this index and the current second element index gives the number of valid triplets for a particular pair. Jan 18, 2025 · To find the triplet in an array whose sum is closest to a given target, two approaches can be utilized. You need to find the number of good triplets. Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j In this article, we have explored an insightful approach/ algorithm to find the 3 elements in an array whose sum is equal to or close to the required answer. I am working on the 3SUM problem (taken from leetcode), which takes a list as input and finds all unique triplets in the lists such that a+b+c=0. Given an array of unsorted numbers and a target number, find a triplet in the array whose sum is as close to the target number as possible, return the sum of the triplet. Given an integer array nums of length n and an integer target, find three integers at distinct indices in nums such that the sum is closest to target. Feb 21, 2025 · The problem requires finding three numbers in the array whose sum is as close as possible to the target. Given an input array nums, the goal is to identify all sets of three elements (a, b, c) where a + b + c = 0, with each triplet returned in non-descending order and without duplication. 4K subscribers 93 Sep 26, 2024 · Given an array of integers and a target value (sum), find three numbers in the array such that their sum equals the target value. Aug 1, 2025 · Given an array arr [] of n integers and an integer target, find the sum of triplets such that the sum is closest to target. So, to try more pairs, we can decrement the end-pointer. * For example, if nums = [2, 1], you can add a '+' before 2 and a '-' before 1 and concatenate them to build the expression "+2 Aug 13, 2025 · [Naive Approach] Generating All Triplets - O (n^3) Time and O (1) Space A simple method is to generate all possible triplets and compare the sum of every triplet with the given target. Can you solve this real interview question? Count Good Triplets - Given an array of integers arr, and three integers a, b and c. The problem asks you to return the actual sum of these three integers (not the difference from the target). LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Note: I have seen other such problems on SO with performance O (n 2 log n) but all of them were solving the easier version of this problem like where arr[i] + arr[j] + arr[k] = S or where they were only checking whether one such triplet exists. &nbsp; Note: If multiple sums are closest to target, return the maximum one. Method 4: Hashing This solution addresses the classic LeetCode 3Sum problem, which requires finding all unique triplets in an array that sum to zero. Sep 9, 2022 · Given an array of unsorted numbers and a target number, find a triplet in the array whose sum is as close to the target number as possible, return the sum of the triplet. Array - 39: Find Triplet Sum which is closest to target Sum Coding Simplified 43. Problem Challenge 1: Quadruple Sum to Target (medium) Leetcode 10. Iterate using three nested loops to find all possible combinations of a triplet (i. We need to return the sum of those three integers. be/cFd4-Dz8 In this post, we are going to solve the 15. e. Return the sum of the three integers. Example 1: Input: a [] = [-2, -4, 6, 3, 7], target = 2 Output: 1 Explanation: Triplet with sum closest to target is [-2, -4, 7], sum of the triplets = 1 Example 2: 3Sum Closest - Given a target number & list of numbers, find a triplet of numbers from the list such that the sum of that triplet is the closest to the target. Sep 14, 2025 · Given an unsorted integer array, find a triplet with a given sum in it. Can you solve this real interview question? 3Sum Closest - Given an integer array nums of length n and an integer target, find three integers in nums such that the sum is closest to target. Apr 15, 2020 · Now for each element, you check if arr [i] + arr [start] + a [end] less than targetSum, it it's true than you increase the triplet count by end - start & increase the start Nov 14, 2024 · Learn how to solve the 3 Sum problem by finding all distinct triplets that add up to a given sum. The array contains all feasible triplets, and we can iterate through them all to see if their sums match the desired value. Jul 23, 2025 · Given a sorted array arr [] and a target value, the task is to find the count of triplets present in the given array having sum equal to the given target. Triplet Sum Close to Target (medium) LeetCode 6. Jul 18, 2013 · The question is to find all triplets in an integer array whose sum is less than or equal to given sum S. Triplet Search Logic Iterate through each element as the first triplet member. Given an array&nbsp;arr[]&nbsp;and an integer&nbsp;target, the task is to find the sum of three integers in&nbsp;arr[]&nbsp;such that the sum is closest to&nbsp;target. Aug 1, 2025 · Given an array arr [] of n integers and an integer target, find the sum of triplets such that the sum is closest to target. I am not really sure what my code is doing wrong, b In this video, we solve the classic 3 element Sum / Triplet Sum problem using Java. Find Triplets with Zero Sum - https://youtu. More specifically, the task is to count triplets (i, j, k) of valid indices, such that arr [i] + arr [j] + arr [k] = target and i < j < k. For each position, initialize left/right pointers at subsequent elements and array end. This problem 15. Nov 30, 2023 · Question:- Given an integer array nums of length n and an integer target, find three integers in nums such that the sum is closest to target. For each triplet, check whether the sum of the triplet is equal to the target value or not. You want to build an expression out of nums by adding one of the symbols '+' and '-' before each integer in nums and then concatenate all the integers. Jul 3, 2023 · Basically, in this problem, you are given an array of integers and a target value, the triplet sum problem requires finding three elements from the array whose sum equals the given target. Return the sum of the triplet. Given an array of unsorted integers a and a target, find a triplet in the array whose sum is closest to the target value. It is a non-primitive data type which stores values of similar data type. Exponent Get updates in your inbox with the latest tips, job listings, and more. Following is an algorithm to find triplets whose sum is up to the target value using a brute force approach: Declare and initialize an array and a target value. Jul 24, 2022 · Triplet Sum Close to Target in O (N²) Time Problem Statement Given an integer array nums of length n and an integer target, find three integers in nums such that the sum is closest to target. As per the problem statement we have to get all the triplets in the array whose sum is equal to a specific number. Navigating Triplets: Solving the Three Sum Problem in Python Introduction: Welcome back to our problem-solving series! Today, we’re diving into a more complex challenge: the Three Sum problem. This … If the sum of the two numbers pointed by the two pointers is greater than the target sum, this means that we need a pair with a smaller sum. We'll walk you through the step-by-step process of solving this problem, providing clear explanations and algorithmic insights along the way. Apr 9, 2024 · In this tutorial, we explore the challenge of identifying a triplet in an array whose elements add up to a specified target value. To efficiently find such a triplet, we can use a combination of sorting and the two-pointer technique. Your task is to find three integers from the nums array such that their sum is as close as possible to the target value. Finding triplet sum is a common interview problem that asks us to determine three numbers in an array that sums to the target value. To follow a similar approach, first, we will sort the array and then iterate through it taking one number at a time. For example, for the array [1, 4, 45, 6, 10, 8] and the target sum 22, the triplet (4, 10, 8) would sum to 22. But once you start worrying about duplicate triplets, brute-force inefficiency, and clever optimization Solution: Squaring a Sorted Array Triplet Sum to Zero (medium) Solution: Triplet Sum to Zero Triplet Sum Close to Target (medium) Solution: Triplet Sum Close to Target Triplets with Smaller Sum (medium) Solution: Triplets with Smaller Sum Apr 18, 2024 · The problem statement asks us to find three integers in a given integer array nums such that their sum is closest to a given target integer. Jul 8, 2025 · The goal sounds simple enough: find all unique triplets in an array that sum up to zero. The triplets may or may not be unique, and the order of the elements in each triplet does not matter. Learn how to find all unique triplets in an array that sum up to a given Three Sum Introduction The Three Sum problem involves finding all unique triplets of numbers in an array that sum up to a given target. Jul 23, 2025 · In the worst case, this approach also takes O (n^3) time but in the average case, it is much faster than Naive approach as we are iterating over only those triplets whose sum is equal to target. Though straightforward, this method has a time complexity of O (n^3), making it less efficient for large arrays. Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j In this tutorial, I have explained multiple approaches to solve triplet sum in array with their code. Jan 19, 2023 · In Java, Array is an object. 3Sum problem of Leetcode. Given an array, find the triplet whose sum is closest to the target 🧠 Brute force? Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j Given an array of unsorted numbers and a target number, find a triplet in the array whose sum is as close to the target number as possible, return the sum of the Detailed solution for 3 Sum : Find triplets that add up to a zero - Problem Statement: Given an array of N integers, your task is to find unique triplets that add up to give a sum of zero. Triplets with Smaller Sum (medium) LintCode 7. The “3Sum” problem presents a common computational challenge: finding all unique triplets in an array of integers such that their sum equals zero. 3Sum is a Leetcode medium level problem. Write a function to return the Aug 15, 2016 · Given an array of n integers nums and an integer target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. In short, you need to return an array of all the unique triplets [arr[a Can you solve this real interview question? Target Sum - You are given an integer array nums and an integer target. Mar 31, 2020 · Given an array arr of unsorted numbers and a target sum, count all triplets in it such that arr+arr+arr < target where i , j , and k are three different indices. 3Sum Leetcode Solution The “3Sum” problem is a classic algorithmic challenge where the goal is to find all unique triplets in an array that sum up to a target value. Oct 5, 2022 · Given an array of unsorted integers a and a target, find a triplet in the array whose sum is closest to the target value. Oct 31, 2014 · The question is such: Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. As an extension of the classic Two Sum problem, it can be solved efficiently by building on top of that problem and applying a variety of sorting and hashing approaches. This is an extension of the 3 Sum problem where the resulting sum needed not be exact. Here triplets refer to any three Jul 23, 2025 · The naive approach is to explore all the triplets using three nested loops and if the sum of any triplet is equal to given target then increment the counter by 1. This problem follows the Two Pointers pattern and shares similarities with Pair with Target Sum. Follow our step-by-step guide with examples. , i, j, k). . A couple of differences are that the input array is not sorted and instead of a pair we need to find triplets with a target sum of zero. Naive Approach Using three nested loops is the simplest way to solve this issue. Mar 17, 2025 · The goal is to identify a triplet of array elements whose sum is the specified target value given an array of integers and a target sum. Calculate current sum and compare differences to track optimal closeness. Dec 15, 2015 · Welcome to Subscribe On Youtube 15. Dutch National Flag Problem (medium) CoderByte 9. Subarrays with Product Less than a Target (medium) LeetCode 8. We employ an optimized ap Feb 20, 2025 · This approach first sorts the array and then uses the two-pointer technique to find a triplet where the sum of two numbers equals the third number. 3Sum Description Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j In general, given an array of n elements and a target sum C, the problem is to find all triplets (a, b, c) in the array such that a + b + c = C. Jan 15, 2024 · 15. Let's see code, 15. Triplet Sum to Zero (medium) LeetCode 5. Mar 9, 2024 · The countTripletsBinarySearch() function uses the Python module bisect to efficiently find the insertion point where the third element of the triplet would be placed, without exceeding the target sum. Examp 3 Sum | Brute, Better & Optimized Approach with Codes | Leetcode 15 Longest Consecutive Sequence (LeetCode 128) | Full solution quick and easy explanation | Interviews If the sum of the two numbers pointed by the two pointers is greater than the target sum, this means that we need a pair with a smaller sum. Note: If there are multiple sums closest to target, print the maximum one. You may assume that each input would have exactly one solution. Prompt: Given an array of unsorted numbers and a target number, find a triplet in the array whose sum is as close to the target number as possible, return the sum of the triplet. 3Sum.

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