Gfg 3 Sum Problem. 3. For each index check the base cases. Problem link: https://
3. For each index check the base cases. Problem link: https://practice. com/in/navdeep-singh-3aaa14161/馃シ Discord: https: Oct 3, 2025 路 Given an array arr [] of distinct integers and an integer target, find all unique combinations of array where the sum of chosen element is equal to target. Using our Chrome & VS Code extensions you can save code snippets online with just one-click! Given an array of integers arr[] and a number k. 52K subscribers Subscribed 3 days ago 路 Medium Problems Pair Sums Divisible by k Subarray with sum divisible by k 3 Sum - Count all triplets with Given sum 3 Sum – Find All Triplets with Zero Sum Itinerary from a given list of tickets Longest Subarray with Majority Greater Than K Number of Employees Under every Employee Largest subarray with 0 sum Subarray with given sum Jul 23, 2025 路 Base cases: If the target sum (sum) is 0, there is only one way to make the sum, which is by not selecting any coin. Given an integer array arr, return all the unique triplets [arr [i], arr [j], arr [k]] such that i != j, i != k, and j != k, and arr [i] + arr [j] + arr [k] == 0. * Each number is used at most once. Oct 6, 2024 路 In this article, we’ll discuss a well-known LeetCode problem, 3Sum (Problem 15). I’ll walk you through the problem statement, my approach to solving it, and an optimized Java solution. Jul 23, 2025 路 [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. . The 3 Sum problem finds all unique triplets in an array that sum up to a target value, ensuring no duplicate triplets are returned Practice DSA with GfG 160 - 160 DSA Problems. Jan 20, 2024 路 The 2-Sum, 3-Sum, and 4-Sum problems are variations of a classic problem in computer science that involves finding combinations of elements in an array that satisfy a specific condition. Odd or Even 2. Sep 2, 2025 路 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. 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. geeksforgeeks. The first step GFG Problem of the day is based on this pattern, replace K with 0 to solve this question. Return the maximum sum of a subarray of size k. With diverse topics, detailed explanations, and a supportive community, this repository is your gateway to mastering algorithms, data structures, and more!馃殌 - GeeksforGeeks-POTD/March 2025 GFG Platform to practice programming problems. Jul 30, 2024 路 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. or Welcome to the daily solving of our PROBLEM OF THE DAY with Siddharth Hazra. Exclude the current element from the subset and recur for the remaining elements. 1. Examp 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. You may assume that each input would have exactly one solution. Aug 1, 2025 路 Given an array arr [] of n integers and an integer target, find the sum of triplets such that the sum is closest to target. Jul 23, 2025 路 Given an array arr [] of size n, the task is to divide it into two sets S1 and S2 such that the absolute difference between their sums is minimum. Please don't post any solutions in this discussion. I’ll walk you through the problem statement, my approach… 馃馃徑鈾傦笍DSA | Day- 1 of 365 please don’t judge 馃 Today problems i done:- GFG:- 1. 馃専 Welcome to the vibrant world of GeeksforGeeks Daily Problem of the Day solutions! Dive into a treasure trove of daily challenges meticulously crafted to sharpen your problem-solving skills. Problem Constraints * -3 * 108 <= B <= 3 * 108 * 1 <= N <= 104 * -108 <= A[i] <= 108 Input Format First argument is an integer array A of size N. 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. Jul 13, 2025 路 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]. If the target sum (sum) is negative or no coins are left to consider (n == coins. Examples: 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. Aug 13, 2025 路 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. Two combinations are unique if the 1. Introduction This blog post addresses the Three Number Sum (3Sum) problem, a more complex variant of the Two Number Sum problem. 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. Jul 23, 2025 路 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 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. size), then there are no ways to make the sum, so count (sum, coins, 0) = 0. May 20, 2021 路 3 sum closest | Problem of the Day | May 20 2021 | GFG Practice | Hindi sKSama 5. For each fixed number a, we place two pointers: l starts just after i, r starts at the 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]. linkedin. In this video, we'll are going to solve the question - Find the first missing positive number from the array. Sum of Natural Numbers 4. Learn by doing, write clean code, and gain confidence through hands-on Python practice. If you'd like to share your solution for feedback and ideas, please head to the solutions tab and post it there. You have to find all unique quadruples from the given array whose sum is equal to the given target. Given an array arr[] and an integer target, determine if there exists a triplet in the array whose sum equals the given target. org/problems/subarray-with-0-sum- Given an array of integers arr[] and a number k. If there is a set S with n elements, then if we assume Subset1 has m elements, Subset2 must have n-m elements and the value of abs (sum (Subset1) - sum (Subset2)) should be minimum. The list must not contain the same combination twice, and the combinations may be returned in any order 3 Sum - Problem Description Given an array A of N integers, find three integers in A such that the sum is closest to a given number B. It ensures that moving the left or right pointer will increase or decrease the sum in a predictable way. The same element may be chosen any number of times to make target. Jan 11, 2025 路 If you take a closer look at this problem, this is mainly an extension of Longest Subarray with 0 sum. As we see, the elements don鈥檛 have to be consecutive, and the indices can鈥檛 repeat in t Jul 23, 2025 路 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. Note: If there are multiple sums closest to target, print the maximum one. Return the sum of the three integers. Note: A subarray is a contiguous part of any given array. Aug 13, 2025 路 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. Note: If multiple sums are closest to target, return the maximum one. Oct 22, 2025 路 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. The goal is to find all triplets in an array that sum up to a given target value. GFG POTD:https://www. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & check your Oct 20, 2024 路 The idea is to store sum of all the pairs with their indices in the hash map or dictionary. Examples: Input: arr [] = [3, 34, 4, 12, 5, 2], sum = 9Output: true Explanation: Here there exists a subset wit 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. Includes bonus problems and videos to strengthen your DSA skills step by step. Return true if such a triplet exists, otherwise, return false. So, Start solving this 450 DSA Cracker from today itself. In short, you need to return an array of all the unique triplets [arr[a 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. The idea is based on the fact that if Sj - Si = k (where Si and Sj are prefix sums till index i and j respectively, and i < j), then the subarray between i+1 to j has sum equal to k. Your All-in-One Learning Portal. Two Pointers Intuition After sorting the array, we can fix one number and then search for the other two using the two-pointer technique. The same number may be chosen from candidates an unlimited number of times. 馃殌 https://neetcode. Example 1: Input: nums = [1,5,11,5] Output: true Explanation: The array can be partitioned as [1, 5, 5] and [11]. Learn how to efficiently solve the 3 Sum Problem with step-by-step solutions, expert insights, and practical coding examples. If the sum is odd, this cannot be two subsets with an equal sum, so return false. You may return the combinations in any order. Second argument is an integer 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 Nov 14, 2025 路 Include the current element in the subset and recur for the remaining elements with the remaining Sum. We鈥檒l focus on the following one. So, count (0, coins, n) = 1. e for any quadruple [q1, q2, q3, Given an array of positive integers arr [] and a value sum, determine if there is a subset of arr [] with sum equal to given sum. Keep a track of all the problems mentioned below: Practice Love Babbar DSA Sheet Below is the topic-wise distribution of 450 Learn how to solve the Three Number Sum problem by finding all triplets in an array that sum up to a target value. Example 2: Input: nums = [1,2,3,5] Output Learn how to efficiently solve the 3 Sum Problem with step-by-step solutions, expert insights, and practical coding examples. Given an array arr[] of integers, determine whether it contains a triplet whose sum equals zero. The media could not be loaded, either because the server or network failed or because the format is not supported. Sum of Squares of First n Natural Mar 18, 2024 路 Learn about two solutions to the integer 3Sum problem. Can we change our array somehow so that this search becomes faster? 3. 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. Assume that there will only be one solution. Free Career Guidance available too. This sheet can be completed within 2-3 months without any cheat day. 2. Solve company interview questions and improve your coding intellect Nov 20, 2020 路 Practice 3sum coding problem. For example, arr [] = [5, 2, -3, 4, 7] and k = 3. Sorting helps in two ways: It lets us skip duplicates easily. Given an array arr of non-negative integers and an integer target, the task is to count all subsets of the array whose sum is equal to the given target. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. 52K subscribers Subscribed Your task is to complete the function find3Numbers () which takes the array arr [], the size of the array (n) and the sum (X) as inputs and returns True if there exists a triplet in the array arr [] which sums up to X and False otherwise. Practice Python coding online with 195+ real challenges on CodeChef. Multiplication Table 3. Jul 23, 2025 路 Base Cases: isSubsetSum (arr, n, sum) = false, if sum > 0 and n = 0 isSubsetSum (arr, n, sum) = true, if sum = 0 Follow the below steps to implement the recursion: Build a recursive function and pass the index to be considered (here gradually moving from the last end) and the remaining sum amount. For example, if and , the solution is but not . Given an array arr[] of integers and another integer target. io/ - A better way to prepare for Coding Interviews馃馃捈 LinkedIn: https://www. Does the array contain a triple of integers whose sum is ?Each element can appear in the triple only once. org/problems/subarray-with-0-sum- May 20, 2021 路 3 sum closest | Problem of the Day | May 20 2021 | GFG Practice | Hindi sKSama 5. We will discuss the entire problem step-by-step and work towards developing an o GFG Problem of the day is based on this pattern, replace K with 0 to solve this question. The problem discussion is for asking questions about the problem or for sharing tips - anything except for solutions. Return a list of all possible valid combinations. This is essentially the classic Two Sum problem, which can be solved efficiently using two pointers on a sorted array. Note: The triplets must be returned in sorted order, the solution vector should also be sorte 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. 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. There鈥檚 an integer array and the number . Feb 6, 2022 路 Save code snippets in the cloud & organize them into collections. Problem Given an array of integers, find all triplets in the array that sum up to a given target value. Note: All the quadruples should be internally sorted, i. Why does sorting help? It comes in several variations. Aug 25, 2025 路 Know how to use STL as it will make data structures and few techniques easier to implement. Return the sum of those three integers.
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