3 Sum Triplet Sum In Array. If such a triplet is present, we need to print it and return tru

If such a triplet is present, we need to print it and return true. 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. Notice that the solution set must not contain duplicate triplets. Example 1: Input: nums = [1,2,3,4] Output: [1,3,6,10] Explanation: Running sum is obtained as follows: [1, 1+2, 1+2+3, 1+2+3+4]. Run the inner loop from position i+1 to position n, then the outer loop from start to end. Jan 8, 2025 · Given an array arr [], and an integer target, find all possible unique triplets in the array whose sum is equal to the given target value. 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. Since there can be multiple valid pairs, we add each one to the hash set (to manage duplicates) while ensuring that all indices in the triplet are distinct. Triplet Sum in an Array | Data Structures & Algorithms | Programming Tutorials | GeeksforGeeks GeeksforGeeks 996K subscribers Subscribed 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. The first loop will traverse from start to end (loop counter i), the second loop will run from i+1 to end (l Problem Description You are given an integer array nums. 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 != k, and nums[i] + nums[j] + nums[k] == 0. The solution set must not contain duplicate triplets. 2. Examples: 3Sum Problem Explained in 3 Minutes | Coding Interview Must-Know Master the 3Sum coding interview problem in just a few minutes 🚀 In this video, I explain how to find all unique triplets in an array whose sum equals zero, using: Sorting Two-Pointer Technique Duplicate handling This approach runs in O (n²) time and is frequently asked in "3Sum," involves finding all unique triplets in an array that add up to zero. Jul 23, 2025 · The 3-Sum problem is a classic algorithmic problem where the objective is to find all unique triplets in an array that sum up to a specific target value, usually zero. Jun 11, 2024 · What is triplet sum and how to find triplet sum in an array? Since this is critical for almost all programmers, check out for more. For each item, we either consider the current number or leave it out and repeat for the remaining numbers. Skip Duplicates: After finding a triplet or moving a pointer, always skip the duplicate numbers to avoid duplicate triplets in the result. The first part of the problem statement is clear, we are asked to find out all the triplets in the given array whose sum is equal to zero. 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 3Sum Given an integer array nums, return all the triplets [nums [i], nums [j], nums [k]] such that i != j, i != k, and j != k, and nums [i] + nums [j] + nums [k] == 0. Using Recursion. Now in case the given array is already sorted, we can further optimize the space using two pointers technique. Two Sum - Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. Hashing-Based Solution - Using HashSet. Given an array of unsorted numbers, find all unique triplets in it that add up to zero. In short, you need to return an array of all the unique triplets [arr [a Apr 15, 2024 · Check for Zero Sum: If the sum of the numbers at the two pointers with the fixed number is zero, record the triplet. The Two-pointer Technique is used in this effective approach for triplet sum in array. Recursion is used in this solution, and the concept is similar to the 0-1 Knapsack problem. A triplet is nothing but a set of three numbers in the given array. We are given an array arr of length n and a sum s. Jan 24, 2022 · Let us try to understand the problem statement. 📌 In this video, we will solve the 3 Sum Problem (LeetCode 15) using Java with complete clarity. We can return triplets in any order, but all the returned triplets should be internally sorted, i. It first sorts the array and then iterates through it, using two pointers to find pairs that, together with the current element, sum up to 0. We define a running sum of an array as runningSum [i] = sum (nums [0]…nums [i]). 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 Jan 15, 2024 · 15. May 4, 2023 · In this article by Scaler Topics, you will learn how to find triplet sum in array by using different methods and code examples in Java, Python and C++. If there is such a triplet present in array, then print the triplet and return true. Sep 14, 2025 · Given an unsorted integer array, find a triplet with a given sum in it. geeksforgeeks. are triplets. Efficient Approach - Using Two-Pointer Technique. This reduces the problem from finding three numbers that sum to zero to finding two numbers that sum to a target value. Nov 20, 2020 · The most trivial approach would be to find all triplets of the array and count all such triplets whose ‘SUM’ = 'K'. . Apr 15, 2024 · Check for Zero Sum: If the sum of the numbers at the two pointers with the fixed number is zero, record the triplet. The array can be sorted to increase the algorithm's efficiency. I have explained Brute Force, Better, and Optimized (Two Poi I am not really sure what my code is doing wrong, but it currently returns an empty list for this list [-1, 0, 1, 2, -1, -4], so it is not recognizing any triplets that sum to 0. Initialise a count variable and consider the above four cases one by one: Oct 6, 2024 · Given an array nums of n integers, the task is to find all unique triplets (i. 1. Follow our step-by-step guide with examples. , three numbers) in the array which sum to zero. 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. Jul 23, 2025 · Given an array of positive integers, the task is to determine if a Pythagorean triplet exists in the given array. 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. or Mar 15, 2022 · Build a frequency array, freq of size mx + 1 and store the frequency of all the elements of the array A []. , for any triplet [q1, q2, q3], the condition q1 ≤ q2 ≤ q3 should hold. Can you solve this real interview question? Running Sum of 1d Array - Given an array nums. For example, if nums= [1,2, 3,4] is the given array, [1,2,3] [2,3,4] [1,3,4] etc. Specifically, you need to return all triplets [nums[i], nums[j], nums[k]] that satisfy these conditions: The three indices must be different: i != j, i != k, and j != k The sum equals zero: nums[i] + nums[j] + nums[k] == 0 The solution set must not Jan 8, 2025 · Given an array arr [], and an integer target, find all possible unique triplets in the array whose sum is equal to the given target value. Exponent Get updates in your inbox with the latest tips, job listings, and more. The most trivial approach would be to find all triplets of the array and count all such triplets whose ‘SUM’ = 'K'. 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 Naive Approach. The solution uses sorting combined with a two-pointer technique. Examples: Dec 23, 2022 · In this problem, you must find all unique triplets in an array that sum up to a specific target value. Iterate through the Jul 23, 2025 · [Expected Approach] Using Hash Map - O (n^3) Time and O (n) Space [Naive Approach] Using Three Nested Loops - O (n^3) Time and O (1) Space The simplest approach is to generate all possible triplets using three nested loops and if the sum of any triplet is equal to zero then add it to the result. , nums [i] + nums [j] + nums [k] == 0), you can use a modified version of the “3Sum” algorithm. A triplet {a, b, c} is considered a Pythagorean triplet if it satisfies the condition a2 + b2 = c2. We can find the answer using three nested loops for three different indexes and check if the values at those indexes sum up to 'K'. After sorting the array, for each element nums[i], we use two pointers to find pairs in the remaining array that sum to -nums[i]. This problem is a variation of the more general "3Sum" problem, where the target sum is zero. Examples Example 1 Input: [-3, 0, 1, 2, -1, 1, -2] Output: [ [-3, 1, 2], [-2, Consider the following problem: Given an unsorted array of integers, find all triplets that satisfy x^2 + y^2 = z^2. Jan 25, 2024 · In the worst case, where all possible triplets sum to zero, the space complexity would be O (n), where “n” is the length of the input array. In this method, we will find all the possible triplets and compute their sum, till we get the desired sum. 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`. Example 1: Input: nums = [-1,0,1,2,-1,-4] Output: [[-1,-1,2],[-1,0,1]] Explanation: nums[0] + nums[1] + nums[2] = (-1 Given an array, we need to find if there is a triplet in the array whose sum is equal to a given value. The 3Sum problem involves finding all unique triplets in an array whose sum is zero. 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. Jan 15, 2024 · 15. Three Sum Introduction The Three Sum problem involves finding all unique triplets of numbers in an array that sum up to a given target. First, sort the array in ascending order. Else, return false. Nov 14, 2024 · Learn how to solve the 3 Sum problem by finding all distinct triplets that add up to a given sum. I solved it using the two-pointer approach: 1. You may assume that each input would have exactly one solution, and you may not use the same element twice. Jul 23, 2025 · We have discussed two approaches, that works for both sorted and unsorted arrays, in the post 3 Sum - Count all triplets with given sum. We will create 3 nested for loops to find different combinations of triplets. Problem link: https://practice. For example if given array is 1, 3, 7, 5, 4, 12, 13, the answer should be 5, 12 In this video, we'll are going to solve the question - Find the first missing positive number from the array. Note: If there are multiple sums closest to target, print the maximum one. Your task is to find all unique triplets in the array where three numbers add up to zero. Oct 20, 2024 · Then, for each element in the array, we check if the pair which makes triplet's sum zero, exists in the hash map or not. Return true if such a triplet exists, otherwise, return false. The 3 Sum problem finds all unique triplets in an array that sum up to a target value, ensuring no duplicate triplets are returned To solve the problem of finding all unique triplets in an integer array nums such that the sum of the elements in each triplet is equal to zero (i. To solve the problem of finding all unique triplets in an integer array nums such that the sum of the elements in each triplet is equal to zero (i. Return the running sum of nums. 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. O (N^3 Log m) Brute force Travel all the triplets which sums to 0. e. Follow our clear and concise explanation to understand the approach and code for this problem. Given an array arr[] and an integer target, determine if there exists a triplet in the array whose sum equals the given target. If the sum is equal to target, return true. Learn efficient algorithms and step-by-step code examples to find all unique triplets in an array that sum to zero using Python. Otherwise, return false. The task is to return a list of these triplets. To get unique triplets, we can use set data Dec 15, 2015 · Welcome to Subscribe On Youtube 15. ️ Day 51 Completed – 160 Days DSA Challenge Today’s problem: Count Triplets With Given Sum 🔢 Given a sorted array, we need to count how many triplets (i, j, k) satisfy: arr [i] + arr [j For the input array [7, 12, 3, 1, 2, -6, 5, -8, 6] and target sum 0, the threeNumberSum method finds all the unique triplets whose sum is 0. The simple approach to the above mentioned problem is to generate all the possible triplets and compare each triplet's sum to the given value. 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 Jul 23, 2025 · Given an array and a value, find if there is a triplet in array whose sum is equal to the given value. Jul 20, 2024 · Solve the "3Sum" problem in Python. 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.

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