Three Sum Problem Java. Note: If there are multiple solutions, return the maximum one. I

Note: If there are multiple solutions, return the maximum one. I have explained Brute Force, Better, and Optimized (Two Poi Three Sum Problem Problem Statement Given an array of integers nums, find all unique triplets in the array that sum up to zero. com/problems/two-sum/more Mar 26, 2022 · This article will cover and explain a solution to the Leetcode problem 3Sum. This will be solved keeping the foundation of "2-SUM" so that you can easily relate and understa 3Sum Leetcode Solution - Given an array of n integers, are there elements a, b, c in array such that a + b + c = 0? Find all unique triplet. For the two-sum problem, if we fix one of the numbers, say x, we have to scan the entire array to find the next number y, which is value - x where value is the input parameter. This is really helpful for my channel and also motivates m Path Sum Sum of Left Leaves Same Tree Diameter of Binary Tree Convert Sorted Array to BST Balanced Binary Tree Minimum Depth of Binary Tree Maximum Binary Tree Scramble String Print Binary Tree Trim a Binary Search Tree Different Ways to Add Parentheses Predict the Winner House Robber III Employee Importance Longest Univalue Path Longest Jul 27, 2021 · 16. Leetcode 15 - 3Sum (JAVA Solution Explained!)If you like this video, please 'Like' or 'Subscribe'. 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 computational complexity theory, the 3SUM problem asks if a given set of real numbers contains three elements that sum to zero. 🔥 Solved the 3SUM Problem in Java! This one’s a classic DSA question that checks your grasp on two pointers, sorting, and edge case handling. takeuforward is the best place to learn data structures, algorithms, most asked coding interview questions, real interview experiences free of cost. Checkout the problem link 👇🏼 4 Sum | Brute - Better - Optimal with Codes https://takeuforward. Sqrt(x) You are given a non-negative integer `x`, return the square root of `x` rounded down to the nearest integer. The goal is to find all triplets in an array that sum up to a given target value. instagram. Jan 25, 2024 · Java LeetCode Problem-15 3Sum [Medium] (Java) Welcome to the 15th coding challenge of leetcode problem series. 4 Sum Problem (Leet code 18) : This is Lecture 39 of DSA Placement Series. The better approach is to use 3 pointer method. We will create 3 nested for loops to find different combinations of Please write 3 Java programs Here is the description for each of the three: 1 . Two Pointers Algorithm in GeeksforGeeks | 3 Sum Problem | Java Placement Course | Lecture 31 Anuj Bhaiya Java Course 4. Mar 26, 2022 · This article will cover and explain a solution to the Leetcode problem 3Sum. Create a set to keep the track of triplets we have visited. Follow our clear and concise explanation to understand the approach and code for this problem. Given an integer array `nums`, return all the triplets `[nums[i], nums[j], nums[k]]` where `nums[i] + nums[j] + nums[k] == 0`, and the indices `i`, `j` and `k` are Dec 1, 2016 · I'm studying the 3 Sum to implement it on my own, and came across the following implementation with the rules: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 2 Sum Problem | 2 types of the same problem for Interviews | Brute-Better-Optimal take U forward 960K subscribers Subscribed Dec 1, 2016 · I'm studying the 3 Sum to implement it on my own, and came across the following implementation with the rules: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = Oct 6, 2024 · In this article, we’ll discuss a well-known LeetCode problem, 3Sum (Problem 15). My aim to provide more than just solutions. Examples : Method 2: Two pointer Technique Method 3: Hashing We will now get started with 3 Sum problem. 😮 🧠 In this mind-blowing Three Sum Introduction The Three Sum problem involves finding all unique triplets of numbers in an array that sum up to a given target. If so, is there a way to get rid of a loop? Or maybe there's an alternative, but more efficient algorithm? Thanks. Examples Example 1: Input: nums = [-1, 0, 1, 2, -1, -4] Output: [[-1, -1, 2], [-1, 0, 1]] Explanation: - nums[0] + nums[4] + nums[2] = (-1) + (-1) + 2 = 0 Sep 2, 2025 · Commonly used for problems like finding subarrays with a specific sum, finding the longest substring with unique characters, or solving problems that require a fixed-size window to process elements efficiently. In a sorted array a binary search will yield that index (or -index-1 for the insert position when not found). 4 SELECT within SELECT In which we form queries using other queries. Want to study for Tech Placements/Internships from us :O Given an array arr[] and an integer target, the task is to find the sum of three integers in arr[] such that the sum is closest to target.   Note: If multiple sums are closest to target, return the maximum one. Example 1: Input: nums = [1,2,3,1] Output: true Explanation: The element 1 occurs at the indices 0 and 3. In this video, we will see another popular Question "3-SUM". This will be solved keeping the foundation of "2-SUM" so that you can easily relate and understa Jul 23, 2025 · [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. The first step Consider the following problem: Given an unsorted array of integers, find all triplets that satisfy x^2 + y^2 = z^2. The other optimisation is that having two values, the third sought value can be determined. 📌 In this video, we will solve the 3 Sum Problem (LeetCode 15) using Java with complete clarity. Let's dive in and find a solution togeth Start Your Interview Prep with This | Two Sum | Leetcode 1 | Easy | coding interview problems tamil Apr 7, 2023 · Having a List of 3 Integers is not as good as an int[3] array. I'm fairly new to complexity analysis, so I was wondering whether my guess of this algorithm not being quadratic was correct or not. com/channel/UCZJRtZh8O6FKWH49YLapAbQ?sub_confirmation=1 join our facebook group :- https://www. 5 SUM and COUNT In A free collection of curated, high-quality competitive programming resources to take you from USACO Bronze to USACO Platinum and beyond. Hashing Problems - Part 3. Written by top USACO Finalists, these tutorials will guide you through your competitive programming journey. 5)` in `c++` or `x 0. more Have a hassle free one stop solution for up-skilling and preparing. Feb 25, 2024 · No description has been added to this video. In each leetcode problem, expect a … May 8, 2024 · 👋 Hello everyone, it's Mansi Singh - Your Coding Companion! 🚀🔴 Today, we're going to solve the Three Sum problem. A triplet is nothing but a set of three numbers in the given array. youtube. Brace yourself for the ultimate challenge with the 'Three Sum' problem - a true brain-bender that has left even tech giants like Microsoft, Google, and Adobe in awe. In this case, n is 50, so the expected result is 50 2, which is 2500. Jul 23, 2025 · Your All-in-One Learning Portal. 5` in `python`. Learn how to efficiently solve the 3 Sum Problem with step-by-step solutions, expert insights, and practical coding examples. The solution set must not contain duplicate triplets. This insight transforms our problem: instead of finding three numbers that sum to zero, we can fix one number nums[i] and then find two numbers in the remaining array that sum to -nums[i]. Why does sorting help? Jul 30, 2024 · Solving the 3Sum Problem in Java and Go The “3Sum” problem is a classic coding challenge that involves finding all unique triplets in an array that add up to zero. This problem is a popular interview question and is commonly used in coding challenges to test a candidate's understanding of arrays, sorting, and efficient algorithms. - For example, do not use `pow(x, 0. Can we change our array somehow so that this search becomes faster? Learn two ways to solve the 3Sum problem in Java by scanning combinations, avoiding duplicates, and handling edge cases without extra clutter. If the sum of the array elements is even, calculate sum/2 and find a subset of the array with a sum equal to sum/2. Can you solve this real interview question? Contains Duplicate - Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Then, return the sum which is closest to target. Example 1: Input: nums = [1,5,11,5] Output: true Explanation: The array can be partitioned as [1, 5, 5] and [11]. Return the indices of the two numbers, index1 Jul 23, 2025 · The 2-Sum problem is a popular algorithmic challenge where the goal is to identify two distinct elements in an array whose sum equals a specific target. Explained it c Sep 25, 2019 · Constructor parameters are three integer (= three indices). 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. 42K subscribers Subscribed Dec 23, 2022 · In this problem, you must find all unique triplets in an array that sum up to a specific target value. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Nov 27, 2023 · Understand the different ways to solve the 4 Sum problem using naive approach and 4 pointer method with examples in C++, Python and Java. I recommend you first solve Two Sum and/or Two Sum 2 prior to… Jan 24, 2022 · Let us try to understand the problem statement. Instead of recalculating the sum from scratch every time, we precompute a new matrix where each element contains the sum of a specific submatrix from the top-left corner to that cell. 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'. Method 1: Naive Approach In this method, we will find all the possible triplets and compute their sum, till we get the desired sum. We are given an array arr of length n and a sum s. Mar 11, 2018 · Our goal in this problem is finding indices of two numbers in given array and their sum should be the target number. Example 2: Input: nums = [1,2,3,4] Output: false Explanation: All elements are distinct Can you solve this real interview question? Two Sum II - Input Array Is Sorted - Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. You may assume that each input would have exactly one solution, and you may not use the same element twice. Given an array and a value, find all the triplets in the array whose sum is equal to the given value. Jul 27, 2021 · 16. This is essentially the classic Two Sum problem, which can be solved efficiently using two pointers on a sorted array. You must not use any built-in exponent function or operator. For example, if nums= [1,2, 3,4] is the given array, [1,2,3] [2,3,4] [1,3,4] etc. 3 Sum (LeetCode 15) | Full solution with examples and visuals | Interview Essential LeetCode Exercise in Java Tutorial - Two Sum FAST Solution Jul 23, 2025 · [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. 1K subscribers Subscribe Jul 13, 2025 · Prefix Sum Implementation The idea is to create an array prefixSum [] of size n, and for each index i in range 1 to n - 1, set prefixSum [i] = prefixSum [i - 1] + arr [i]. Check out TUF+:https://takeuforward. Oct 21, 2020 · In this artcile, we will learn to resolve the 3Sum problem by using two pointers algorithm Problem Given an array of integers A[N] and an integer number targetSum Find if existing in A three integers A[i], A[j] and A[k] such that A[i] + A[j] + A[ Leetcode 69. Given an array, arr of integers, and another number target, find three integers in the array such that their sum is closest to the target. Sep 15, 2025 · Two pointers is really an easy and effective technique that is typically used for Two Sum in Sorted Arrays, Closest Two Sum, Three Sum, Four Sum, Trapping Rain Water and many other popular interview questions. A generalized version, -SUM, asks the same question on elements, rather than simply 3. org/plus?source=youtubeFind DSA, LLD, OOPs, Core Subjects, 1000+ Premium Questions company wise, Aptitude, SQL, AI doubt Useful Links𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦 - https://www. 8K subscribers Subscribed 3 Sum - In 3_Sum problem, given an array nums of n integers, find all the unique triplets that sum up to 0. Three Sum Problem Problem Statement Given an array of integers nums, find all unique triplets in the array that sum up to zero. The problem emphasizes understanding array manipulation and optimizing search operations through hashing. Have a hassle free one stop solution for up-skilling and preparing. I’ll walk you through the problem statement, my approach to solving it, and an optimized Java solution. 1K subscribers Subscribe Aug 1, 2025 · The naive approach is to explore all subsets of size three and keep a track of the difference between target and the sum of the subset. The sum of the first n odd positive integers is given by the formula n2. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers. Example 2: Input: nums = [1,2,3,5] Output Aug 28, 2025 · Struggling with the 3Sum problem on LeetCode? 🤔 In this article, we’ll break down three approaches — Brute Force, Hashing, and Two Pointers — with Java code, dry runs, and complexity 1 day ago · PROBLEM STATEMENT The objective is to calculate the sum of all odd integers from 1 to 100. Watch this video to clear your doubts on two sum problems and s Can you solve this real interview question? Partition Equal Subset Sum - Given an integer array nums, return true if you can partition the array into two subsets such that the sum of the elements in both subsets is equal or false otherwise. Given an array arr[] and an integer target, determine if there exists a triplet in the array whose sum equals the given target. Example: (-5, 1, 2, 3, 7) --> (0,2,3). Why does sorting help? Oct 6, 2024 · In this article, we’ll discuss a well-known LeetCode problem, 3Sum (Problem 15). 3SUM can be easily solved in time, and matching lower bounds are known in some specialized models of computation (Erickson 1999). Three Sum Introduction The Three Sum problem involves finding all unique triplets of numbers in an array that sum up to a given target. Mathematically, this is the sum of the first 50 odd numbers (1, 3, 5, …, 99). Dec 8, 2025 · Construct an array from its pair-sum array 2 Sum - All Pairs 2 Sum - Distinct Pairs 3 Sum - Find Any 3 Sum - Closest Triplet 4 Sum - Find Any [More problems on 4 Sum in Hard Section] Hard Problems Surpasser Count Trapping Rain Water Top K Frequent Elements Kth Missing Positive Number in a Sorted Array Stock Buy and Sell - At Most K Transactions 3 days ago · The prefix sum of a matrix (or 2D array) is a powerful technique used to efficiently compute the sum of elements in a submatrix. org/plus/dsa/pro 3sum Leetcode Medium | Most popular interview coding question | Three sum leetcode with solution Algo Tamizha 25. Checkout the problem link 👇🏼 3 Sum | Brute - Better - Optimal with Codes https://takeuforward. Oct 19, 2021 · The course walks you through multiple Java algorithms, data structures problems, and their solutions with step by step visualizations, so that you are actually learning instead of blindly 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. Jan 24, 2022 · Let us try to understand the problem statement. com/codingwithprakash/𝐖𝐡𝐚𝐭𝐬𝐀𝐩𝐩𝐂𝐡𝐚𝐧𝐧𝐞𝐥 - https 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. liked this video? Click here https://www. Oct 22, 2025 · Try it on GfG Practice Table of Content The following are the two main steps to solve this problem: Calculate the sum of the array. 3Sum Leetcode Solution - Given an array of n integers, are there elements a, b, c in array such that a + b + c = 0? Find all unique triplet. You can also use the values and hold them in variables for an entire loop. Return true if such a triplet exists, otherwise, return false. facebook. So we use rightDiagonal [i + j] to quickly check if that diagonal is occupied. If the sum is odd, this cannot be two subsets with an equal sum, so return false. Sep 25, 2019 · Constructor parameters are three integer (= three indices). Example 1: ```java Input: x = 9 Output: 3 ``` Example 2 Jan 26, 2024 · Java LeetCode Problem-16 3Sum Closest [Medium] (Java) Welcome to the 16th coding challenge of leetcode problem series. 3 SELECT from Nobel Additional practice of the basic features using a table of Nobel Prize winners. Three Sum Closest (LeetCode 16) | Full Solution with visual explanation | Interview Essential Nikhil Lohia 72. Examples Example 1: Aug 13, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. For example if given array is 1, 3, 7, 5, 4, 12, 13, the answer should be 5, 12 /** * Coursera - Algorithms Part I * Week 1 - Interview Questions - Analysis of Algorithms * * Question 1: 3-SUM in quadratic time * * Design an algorithm for the 3-SUM problem that takes time proportional to N2 * in the worst case. When to Use Two Pointers: In this series, we will solve some of the most frequently asked Leetcode interview questions. org/plus/dsa/pro For the two-sum problem, if we fix one of the numbers, say x, we have to scan the entire array to find the next number y, which is value - x where value is the input parameter. https://leetcode. 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. I recommend you first solve Two Sum and/or Two Sum 2 prior to… Nov 20, 2020 · Approaches 01 Approach The most trivial approach would be to find all triplets of the array and count all such triplets whose ‘SUM’ = 'K'. Return the sum of the three integers. length. co Learn how to solve the Three Number Sum problem by finding all triplets in an array that sum up to a target value. 3Sum Closest Medium Given an array nums of n integers and an integer target, find three integers in nums such that the sum is closest to target. We will create 3 nested for loops to find different combinations of Oct 2, 2022 · Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. Examp Can you solve this real interview question? 4Sum - Given an array nums of n integers, return an array of all the unique quadruplets [nums[a], nums[b], nums[c], nums[d Mar 18, 2024 · Learn about two solutions to the integer 3Sum problem. Method 2: Two pointer Technique Method 3: Hashing We will now get started with 3 Sum problem. I’ll walk you through the problem statement, my approach… This blog post addresses the Three Number Sum (3Sum) problem, a more complex variant of the Two Number Sum problem. The returned integer should be non-negative as well. For Loop: Sum of Even Numbers Problem: Write a Java program that calculates the sum of all even numbers between 1 and 1 Sep 27, 2025 · On a chessboard, all cells on the same top-left to bottom-right diagonal have the same sum of row and column indices (i + j). are triplets. 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. 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. The first solution that comes to mind is to check all numbers and find 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. For example, if the given array is {12, 3, 4, 1, 6, 9} and the given sum is 24, then this is one Learn how to efficiently solve the 3 Sum Problem with step-by-step solutions, expert insights, and practical coding examples. . Tutorials: Learn SQL step by step 0 SELECT basics Some simple queries to get you started 1 SELECT name Some pattern matching queries 2 SELECT from World In which we query the World country profile table.

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