3 Sum Solution Java. Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a c

Jul 23, 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. Video Player is loading. Note: If there are multiple sums closest to target, print the maximum one. Better than official and forum solutions. 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. 3Sum Closest. 3Sum in Python, Java, C++ and more. In this post, we are going to solve the 15. Have a hassle free one stop solution for up-skilling and preparing. com/Neelesh-Janga/Java-Programs/tree/main/0015-3sum Good news, I took an initiative of writing 1 coding question per day for 365 days in an easy and beginner Mar 26, 2022 · This article will cover and explain a solution to the Leetcode problem 3Sum. 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 Practice for coding in leetcode. Dec 23, 2022 · In this problem, you must find all unique triplets in an array that sum up to a specific target value. parseInt (string) converts a string to Aug 20, 2022 · This video has the Problem Statement, Solution Walk-through, Code, for 1. **Example 1:** ```java Input: x = 9 Output: 3 ``` **Example 2 Apr 7, 2023 · Having a List of 3 Integers is not as good as an int[3] array. 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 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 = 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. Let's dive in and find a solution togeth Feb 14, 2023 · Explore and compare three solutions to the Two Sum Problem on LeetCode using Java. Sorting helps in two ways: It lets us skip duplicates easily. You can numerate the sum of two numbers in the list and find the 3rd number by hash or binary search. Follow our clear and concise explanation to understand the approach and code for this problem. Please don't post any solutions in this discussion. We can use this class to read input from a user or a file. Here is the challenge description: Given an array nums of n integers, are there elements a, b, c in nums such Note: The triplets must be returned in sorted order, the solution vector should also be sorted, and the answer must not contain any duplicate triplets. Example 2: Input: nums = [1,2,3,4] Output: false Explanation: All elements are distinct Jul 23, 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. Master this essential concept with step-by-step examples and practice exercises. 3Sum 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 Sum of special triplets having elements from 3 different arrays. Jan 13, 2026 · The addition of sets A and B, known as Minkowski addition, results in a new set where each element is the sum of every possible pair of elements, one from set A and one from set B. These operators are essential in programming as they allow you to manipulate data efficiently. You **must not use** any built-in exponent function or operator. The returned integer should be non-negative as well. 3Sum problem of Leetcode. Crack LeetCode 15 like a pro! Learn efficient strategies for solving three sum problems and excel in coding challenges and job interviews. All solutions are written in Java. Problem Statement: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array w Jul 16, 2019 · I'm currently trying to solve the "three sum" challenge (I'm using java by the way). Example 2: Input: nums = [1] Output: 1 Explanation: The subarray [1] has the largest sum 1. Method 1: Naive Approach In this method, we will find all the possible triplets and compute their sum, till we get the desired sum. Let's see code, 16. Examples: Input : nums = [-1, 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. Notice that the solution set must not contain duplicate triplets. This problem 16. 📌 In this video, we will solve the 3 Sum Problem (LeetCode 15) using Java with complete clarity. Dec 15, 2025 · Remove all nodes which don’t lie in any path with sum>= k Maximum spiral sum in Binary Tree Sum of nodes at k-th level in a tree represented as string Sum of all the numbers that are formed from root to leaf paths Merge Two Binary Trees by doing Node Sum (Recursive and Iterative) Root of the tree from children ID sums Quick Links : Jenkins – an open source automation server which enables developers around the world to reliably build, test, and deploy their software Java > String-3 > sumDigits (CodingBat Solution) Problem: Given a string, return the sum of the digits 0-9 that appear in the string, ignoring all other characters. , ⁠ ⁠. Java Concepts It will cover basic topics in Java language such as classes, data structures, inheritance, exception handling, etc. 😮 🧠 In this mind-blowing Two Sum (LeetCode #1) | 3 Solutions with animations | Study Algorithms Three Sum Closest (LeetCode 16) | Full Solution with visual explanation | Interview Essential Contains all my solutions to LeetCode problems. You may assume that each input would have exactly one solution. You are expected to be proficient in either Java 7 or Java 8. You may return the combinations in any order. 5` in `python`. The other optimisation is that having two values, the third sought value can be determined. com/codingwithprakash/𝐖𝐡𝐚𝐭𝐬𝐀𝐩𝐩𝐂𝐡𝐚𝐧𝐧𝐞𝐥 - https Mar 10, 2025 · Welcome to this wonderful LeetCode Question Solving SeriesTime Stamps00:00 - Question Explanation02:25 - Approach Discussion02:50 - Solution Begins09:30 - Co Nov 2, 2016 · I knew of 2 approaches to solve 3-Sum problem. . 5)` in `c++` or `x ** 0. Example 1: Input: nums = [-2,1,-3,4,-1,2,1,-5,4] Output: 6 Explanation: The subarray [4,-1,2,1] has the largest sum 6. Learn the latest technologies and programming languages including ChatGPT, CodeWhisperer, Google Assistant, Dall-E, Business Intelligence, Claude AI, SwiftUI, Smart Oct 25, 2025 · Java lambda expressions, introduced in Java 8, allow developers to write concise, functional-style code by representing anonymous functions. instagram. In each leetcode problem, expect a … Jan 24, 2022 · We solved the two sum problem in our earlier article, and this problem in some ways is a continuation of the two sum problem. util. The list must not contain the same combination twice, and the combinations may be returned in any order May 8, 2024 · 👋 Hello everyone, it's Mansi Singh - Your Coding Companion! 🚀🔴 Today, we're going to solve the Three Sum problem. You may assume that each input would have exactly one solution, and you may not use the same element twice. 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. e. Integer. , nums [i] + nums [j] + nums [k] == 0), you can use a modified version of the “3Sum” algorithm. In-depth solution and explanation for LeetCode 15. The same number may be chosen from candidates an unlimited number of times. *; Dec 15, 2015 · Welcome to Subscribe On Youtube 15. Check out TUF+:https://takeuforward. Java Implementation Here’s the Java solution based on the approach described: import java. 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. 1K subscribers 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 Leetcode 15. Aug 13, 2025 · 3 Sum – Triplet Sum Closest to Target 3 Sum – Pythagorean Triplet in an array 3 Sum – All Distinct Triplets with given Sum Pythagorean Triplet with given sum Count triplets with sum smaller than a given value Please refer 3Sum - Complete Tutorial for all list of problems on triplets in an array. Example 1: Input: nums = [1,2,3,1] Output: true Explanation: The element 1 occurs at the indices 0 and 3. In the modified array, find 3 elements whose sum is 0. For Solving 3 sum sum Leetcode Problem we can use following procedure : 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. I’ll walk you through the problem statement, my approach to solving it, and an optimized Java solution. 3Sum is a Leetcode medium level problem. org/plus/dsa/pro Understanding the Problem: 3Sum The “3Sum” problem presents a common computational challenge: finding all unique triplets in an array of integers such that their sum equals zero. 3Sum Closest problem of Leetcode. Consider the input [-1, 0, 1 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. Contribute to AaronLiang/LeetCode development by creating an account on GitHub. Nov 12, 2025 · Java operators are special symbols that perform operations on variables or values. So, if you have not yet solved the two sum problem we advice you to do so because it will help you understand the 3 sum problem better. 2. Let's see code, 15. They enable passing code as parameters or assigning it to variables, resulting in cleaner and more readable programs. Two combinations are unique if the In this example, you will learn to display the Fibonacci sequence of first n numbers (entered by the user). I recommend you first solve Two Sum and/or Two Sum 2 prior to… 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 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 Sep 14, 2025 · Given an unsorted integer array, find a triplet with a given sum in it. Three Number Sum Problem solution in Java METHOD 1. Oct 6, 2024 · In this article, we’ll discuss a well-known LeetCode problem, 3Sum (Problem 15). Problem Jul 22, 2025 · Given an integer array arr [], find the subarray (containing at least one element) which has the maximum possible sum, and return that sum. For each fixed number a, we place two pointers: l starts just after i, r starts at the Learn two ways to solve the 3Sum problem in Java by scanning combinations, avoiding duplicates, and handling edge cases without extra clutter. * Each number is used at most once. 3. Sqrt(x) You are given a non-negative integer `x`, return the **square root** of `x` **rounded down** to the nearest integer. Recursive Digit Sum Hackerrank Solution Recursive digit sum HackerRank solution is a problem that challenges participants to understand the concept of recursion while effectively manipulating numbers. java at main · abhideepghosh/Leetcode-GFG-Solutions Jul 31, 2024 · Leetcode 3Sum problem solution in python, java, c++ and c programming with practical program code example and complete full explanation 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 Another method: Subtract C /3 from all elements of the input array. 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. It ensures that moving the left or right pointer will increase or decrease the sum in a predictable way. My aim to provide more than just solutions. Return 0 if there are no digits in the string. 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. You can also use the values and hold them in variables for an entire loop. The problem is given below -- Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a 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 Useful Links𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦 - https://www. Time complexity: O (n^3) Three Sum Introduction The Three Sum problem involves finding all unique triplets of numbers in an array that sum up to a given target. Naive approach: Use three for loops The naive approach is to just use three nested for loops and check if the sum of any three elements in the array is equal to the given target. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: The longest increasing subsequence is [2,3,7,101], therefore the length is 4. Question: In Java A Fibonacci series of numbers is characterized as the following: 0 1 1 2 3, where the sum of the previous two numbers 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 1 day ago · Learn why Python's 'range ()' causes off-by-one errors when summing numbers. 🚀 Prefix Sum Practice – In Progress Today I solved LeetCode 1991 – Find the Middle Index in Array, which reinforces the left & right sum balance concept using Prefix Sums. Can you solve this real interview question? Maximum Subarray - Given an integer array nums, find the subarray with the largest sum, and return its 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`. Fix the logic that produces 2401 instead of the correct 2500 for odd numbers. Problem Description Given an integer array nums of length n and an integer target, find three integers in nums such that the sum is closest to the target. Two Sum, with a Time Complexity of O(n) and Space Complexity of O(n)[Developer Docs Can you solve this real interview question? Coin Change - You are given an integer array coins representing coins of different denominations and an integer amount representing a total amount of money. You may assume that you have an Metadata hackerrank solutions github | hackerrank all solutions | hackerrank solutions for java | hackerrank video tutorial | hackerrank cracking the coding interview solutions | hackerrank data structures | Can you solve this real interview question? Combination Sum - Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. If we find a valid triplet, we add it to output and move both pointers past any duplicate values to ensure unique triplets. Example 3: Input: nums = [5,4,-1 This repository contains all the Leetcode questions I've solved! - Leetcode-GFG-Solutions/3Sum. 3Sum. This blog post addresses the Three Number Sum (3Sum) problem, a more complex variant of the Two Number Sum problem. 3Sum Closest is a Leetcode medium level problem. Checkout the problem link 👇🏼 3 Sum | Brute - Better - Optimal with Codes https://takeuforward. '9'. 3 Sum (LeetCode 15) | Full solution with examples and visuals | Interview Essential LeetCode Exercise in Java Tutorial - Two Sum FAST Solution 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. Return a list of all possible valid combinations. isDigit (char) tests if a char is one of the chars '0', '1', . Examples: Jan 15, 2021 · I need to create a recursive method that takes a number as input (ranging from 3 to 30, exclusive), and finds all the combinations of adding three natural numbers (ranging from 1 to 10, inclusive) so 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 . (Note: Character. Given an array of integers, write a code to find all unique triplets with zero sum. The goal is to find all triplets in an array that sum up to a given target value. Two Pointers Intuition After sorting the array, we can fix one number and then search for the other two using the two-pointer technique. 🔹 What I Jul 23, 2025 · In Java, the Scanner class is present in the java. In a sorted array a binary search will yield that index (or -index-1 for the insert position when not found). Dec 6, 2020 · Find triplets with zero sum (3Sum Problem). Intuitions, example walk through, and complexity analysis. 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, if A= [1,2,3,4] and if you are asked to find 3SUM for C =4, then subtract 4/3 from all the elements of A, and solve it in the usual 3sum way, i. If that amount of money cannot be made up by any combination of the coins, return -1. The problem discussion is for asking questions about the problem or for sharing tips - anything except for solutions. Can you solve this real interview question? Longest Increasing Subsequence - Given an integer array nums, return the length of the longest strictly increasing subsequence. We are given an array arr of length n and a sum s. The problem is part of the HackerRank platform, which offers a wide array of coding challenges to enhance programming skills. In this article, we cover how to take different input values from the user using the Scanner class. 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. org/plus?source=youtubeFind DSA, LLD, OOPs, Core Subjects, 1000+ Premium Questions company wise, Aptitude, SQL, AI doubt Dec 26, 2024 · Record the triplet if the sum equals zero, and skip duplicates for all three elements. 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 Can you solve this real interview question? Combination Sum III - Find all valid combinations of k numbers that sum up to n such that the following conditions are true: * Only numbers 1 through 9 are used. Learn "Max Sum Of Three Subarrays in Java" with our free interactive tutorial. takeuforward is the best place to learn data structures, algorithms, most asked coding interview questions, real interview experiences free of cost. Return the fewest number of coins that you need to make up that amount. Three Sum Closest (LeetCode 16) | Full Solution with visual explanation | Interview Essential Nikhil Lohia 72. Jul 23, 2025 · This section covers matrix operations and algorithms for programmers, including tasks like rotating a matrix, multiplying matrices, and solving problems such as finding islands or calculating the maximum sum submatrix. Aug 22, 2020 · I am solving a problem. Note: A subarray is a continuous part of an array. 1. I have explained Brute Force, Better, and Optimized (Two Poi Dec 1, 2016 · Still, I want to recommend a better solution for this problem. Choose the most optimal approach for time and space complexity. Return the sum of the three integers. - Leetcode-Solutions/3Sum. If you'd like to share your solution for feedback and ideas, please head to the solutions tab and post it there. util package is used to obtain input for primitive types like int, double, etc. Nov 30, 2023 · LeetCode Q-15 Solution: https://github. 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. 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 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 Method 2: Two pointer Technique Method 3: Hashing We will now get started with 3 Sum problem. This problem 15. We will create 3 nested for loops to find different combinations of If the sum is greater than zero, we decrease high to reduce the sum. - For example, do not use `pow(x, 0. 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. 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 Leetcode 69. In this post, we are going to solve the 16. , and strings. java at master · HenryDavidZhu/Leetcode-Solutions 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 25, 2024 · Java LeetCode Problem-15 3Sum [Medium] (Java) Welcome to the 15th coding challenge of leetcode problem series. 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.

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