Triplet Sum In Array Leetcode. 3Sum problem of Leetcode. Example 1: Input: nums = [4,2,3,1] Outp

3Sum problem of Leetcode. Example 1: Input: nums = [4,2,3,1] Output: 9 Explanation: The valid triplets Can you solve this real interview question? Minimum Sum of Mountain Triplets I - You are given a 0-indexed array nums of integers. Triplets, Süm, Sum Sum And More 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. Can you solve this real interview question? Subarray Sums Divisible by K - Given an integer array nums and an integer k, return the number of non-empty subarrays that have a sum divisible by k. Jul 31, 2024 · Leetcode 3Sum problem solution in python, java, c++ and c programming with practical program code example and complete full explanation 6 days ago · Stop guessing. 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 Number of Unequal Triplets in Array - You are given a 0-indexed array of positive integers nums. For each arr[i], use a Hash Set to store potential second elements and run another loop inside it for j from i+1 to n-1. A hash set tracks the values we've already seen, and each valid triplet is sorted before it’s added so duplicates don’t slip through. Sep 10, 2025 · Can you solve this real interview question? Count Good Triplets in an Array - You are given two 0-indexed arrays nums1 and nums2 of length n, both of which are permutations of [0, 1, , n - 1]. Sep 8, 2019 · Given the array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0. For the remaining two elements, we simply use the logic of counting pairs using Hash Set for the subarray arr [i+1 n-1] and sum as (target - arr [i]). Problem link: https://practice. Use this 2-minute decision checklist and a cheat sheet of the 12 core algorithm patterns (with signals, templates, and common traps). 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. 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'. length <= 3000 -10 5 <= nums[i] <= 10 5 Solutions Solution 1: Sort + Two Pointers We notice that the problem does not require us to return the triplet in order, so we might as well sort the array first, which makes it easy to skip duplicate elements. 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 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. Notice that the solution set must not contain duplicate triplets. Triplet Sum in an Array | Data Structures & Algorithms | Programming Tutorials | GeeksforGeeks GeeksforGeeks 996K subscribers Subscribed Jul 23, 2025 · The idea is to iterate over the array and fix the first element of the triplet as arr [i]. Example 3: Input: nums = [3,3,3,3], d = 6 Output: 0 Explanation: Any triplet chosen here has a sum of 9, which is not divisible by 6. We need to Can you solve this real interview question? Maximum Sum of Three Numbers Divisible by Three - You are given an integer array nums. Jul 23, 2025 · Given an array of positive integers, the task is to determine if a Pythagorean triplet exists in the given array. Given an array arr[] and an integer target, determine if there exists a triplet in the array whose sum equals the given target. e. 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 Comprehensive study plan with weekly LeetCode problems covering Two Pointers, Sliding Window, Binary Search, and more. Jun 27, 2017 · Find Triplet That Sum To A Given Value (Part 1) | Algorithm Simplified | Tutorial 18 Find Triplet with Given Sum in an Array | Programming Tutorials LARGEST RECTANGLE IN HISTOGRAM - Leetcode 84 Dec 6, 2020 · Find triplets with zero sum (3Sum Problem). Intuition to solving these… Aug 13, 2024 · Mastering Leetcode Problem-Solving Using Simple JavaScript. 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 Increasing Triplet Subsequence - Given an integer array nums, return true if there exists a triple of indices (i, j, k) such that i < j < k and nums [i] < nums [j] < nums [k]. length <= 1000 May 30, 2024 · I tackled LeetCode problem 15: 3Sum, to find all unique triplets in an array that sum up to zero. or 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 Two Sum (LeetCode #1) | 3 Solutions with animations | Study Algorithms Three Sum Closest (LeetCode 16) | Full Solution with visual explanation | Interview Essential Count Triplets That Can Form Two Arrays of Equal XOR - Given an array of integers arr. Note that the product of an array with a single element is the value of that element. Apr 7, 2023 · 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. 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? Count Good Triplets in an Array - You are given two 0-indexed arrays nums1 and nums2 of length n, both of which are permutations of [0, 1, , n - 1]. Mar 26, 2022 · Leetcode 15–3Sum This article will cover and explain a solution to the Leetcode problem 3Sum. 3Sum in Python, Java, C++ and more. In short, you need to return an array of all the unique triplets [arr[a Jan 25, 2024 · Two-Pointer Technique: After sorting, the algorithm uses a combination of two pointers (left and right) to traverse the array and find triplets that sum up to zero. The solution set must not contain duplicate triplets. Hence, the answer is the total number of triplets which is 4. Jul 23, 2025 · The idea is to use a hash map to store indices of each element and efficiently find triplets that sum to zero. Ideal for coding interviews and skill development. Then, I iterated over the array and used two pointers, one starting from the next element and one from the end, to find the triplets. Follow our clear and concise explanation to understand the approach and code for this problem. If yes, then print the triplet. A good triplet is a set of 3 distinct values which are present in increasing order by position both in nums1 and nums2. 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. Mar 30, 2024 · The Three sum problem series is an extension of Two Sum problem as constructed in this a previous article. 3 days ago · The Strategy My approach was to use the two-pointer technique. Given an array of integers, Write a code to find all unique triplets in the array which gives the sum of zero. Here’s the solution using the two-pointer… 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. If no such triplet exists, return 0. 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. Better than official and forum solutions. But once you start worrying about duplicate triplets, brute-force inefficiency, and clever optimization This version loops through the array with one fixed number and checks if a matching pair completes the sum to zero. Can you solve this real interview question? Maximize Y‑Sum by Picking a Triplet of Distinct X‑Values - You are given two integer arrays x and y, each of length n. A triplet is nothing but a set of three numbers in the given array. 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 Find triplets with zero sum. In other words, if we consider pos1v as the index of the value v in nums1 and Can you solve this real interview question? 3Sum Smaller - Level up your coding skills and quickly land a job. Day 4 of my LeetCode Challenge! Problem:15. 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. In-depth solution and explanation for LeetCode 15. , for any triplet [q1, q2, q3], the condition q1 ≤ q2 ≤ q3 should hold. 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. Can we change our array somehow so that this search becomes faster? Aug 13, 2025 · Step by Step Approach: Iterate through the array, fixing the first element (arr[i]) for the triplet. Nov 20, 2020 · The most trivial approach would be to find all triplets of the array and count all such triplets whose ‘SUM’ = 'K'. In-depth solution and explanation for LeetCode 1442. For example, if nums= [1,2, 3,4] is the given array, [1,2,3] [2,3,4] [1,3,4] etc. This is the best place to expand your knowledge and get prepared for your next interview. 3Sum 💥 Given an array of integers, find all unique triplets which sum to zero. If no such triplet exists, return -1. Jan 24, 2022 · Let us try to understand the problem statement. Hence, the answer is 0. I recommend you first solve Two Sum and/or Two Sum 2 prior to this. Note: If there are multiple sums closest to target, print the maximum one. In this blog… Dec 15, 2023 · Output: 4 Explanation: Any triplet chosen here has a sum of 9, which is divisible by 3. A subsequence of a array is a new array which is formed from the original array by deleting some (can be none) of the characters without disturbing the relative positions of the Watch short videos about triplet sum closest to given sum from people around the world. You must choose three distinct indices i, j, and k such that: * x[i] != x[j] * x[j] != x[k] * x[k] != x[i] Your goal is to maximize the value of y[i] + y[j] + y[k] under these conditions. Nov 30, 2023 · If sum is equal to 0, add the triplet [nums[i], nums[j], nums[k]] to the result list. Number of Divisible Triplet Sums in Python, Java, C++ and more. We want to select three indices i, j and k where (0 <= i < j <= k < arr. Return true if such a triplet exists, otherwise, return false. The test cases are generated so that the answer will fit in a 32-bit integer. A triplet of indices (i, j, k) is a mountain if: * i < j < k * nums [i] < nums [j] and nums [k] < nums [j] Return the minimum possible sum of a mountain triplet of nums. 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 30, 2024 · The “3Sum” problem is a classic coding challenge that involves finding all unique triplets in an array that add up to zero. Count Triplets That Can Form Two Arrays of Equal XOR in Python, Java, C++ and more. We iterate through all pairs (j, k), compute the required third element as -(arr[j] + arr[k]), and check if it exists in the map with a valid index i < j. geeksforgeeks. Dec 23, 2022 · In this problem, you must find all unique triplets in an array that sum up to a specific target value. In this video, we'll are going to solve the question - Find the first missing positive number from the array. A subarray is a contiguous part of an array. Given an array of integers, write a code to find all unique triplets with zero sum. are triplets. I sorted the array first, which made it easier to find the triplets. Dec 15, 2015 · 3 <= nums. Example 1: Input: nums = [2,3,-2,4] Output: 6 Explanation: [2 . Dec 8, 2025 · Count Square Sum Triples - A square triple (a,b,c) is a triple where a, b, and c are integers and a2 + b2 = c2. Example 1: Jul 8, 2025 · The goal sounds simple enough: find all unique triplets in an array that sum up to zero. Can you solve this real interview question? Target Sum - You are given an integer array nums and an integer target. length). Apr 15, 2024 · Move these pointers based on the sum comparison. 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 post, we are going to solve the 15. 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 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-depth solution and explanation for LeetCode 2964. We can return triplets in any order, but all the returned triplets should be internally sorted, i. The solution set 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. This problem 15. 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. Jan 13, 2026 · Can you solve this real interview question? Separate Squares I - You are given a 2D integer array squares. Your task is to choose exactly three integers from nums such that their sum is divisible by three. 3Sum — Python Programming Solution Blind 75 — Programming & Technical Interview Questions — Explanation Series The Problem: Given an integer array nums, return all the triplets … Can you solve this real interview question? Count Good Triplets - Given an array of integers arr, and three integers a, b and c. 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 · 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. 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 Mar 1, 2025 · Given an array of integers nums, find all unique triplets in nums that sum up to zero, where all elements in a triplet are different elements from the array. Find the minimum y-coordinate value of a horizontal line such that the total area of the squares above the line equals the total area of the squares 1 day ago · Can you solve this real interview question? Maximum Side Length of a Square with Sum Less than or Equal to Threshold - Given a m x n matrix mat and an integer threshold, return the maximum side-length of a square with a sum less than or equal to threshold or return 0 if there is no such square. Oct 6, 2024 · Given an array nums of n integers, the task is to find all unique triplets (i. Intuitions, example walk through, and complexity analysis. In other words, if we consider pos1v as the index of the value v in nums1 and Mar 11, 2024 · 3 Sum : Find triplets that add up to a zero. Increasing Triplet Subsequence - Given an integer array nums, return true if there exists a triple of indices (i, j, k) such that i < j < k and nums [i] < nums [j] < nums [k]. Find all unique triplets in the array which gives the sum of zero. Additionally, increment j and decrement k while skipping duplicate values to avoid duplicate triplets. 3Sum provides an unsorted list of integers and asks that you find all unique triplets Tagged with leetcode, algorithms, javascript, tutorial. Check for Zero Sum: If the sum of the numbers at the two pointers with the fixed number is zero, record the triplet. 3Sum is a Leetcode medium level problem. , three numbers) in the array which sum 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 In-depth solution and explanation for LeetCode 15. 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. The solution set must not contain duplicate triplets and the order of the output and the order of the triplets does not matter. Next, we enumerate the first element of the triplet n u m s [i], where 0 ≤ i <n 2. Let's see code, 15. Given an integer n, return the number of square triples such that 1 <= a, b, c <= n. 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. In-depth solution and explanation for LeetCode 16. You need to find the number of good triplets. Aug 13, 2024 · Mastering Leetcode Problem-Solving Using Simple JavaScript. Return the maximum possible sum of such a triplet. 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 Apr 19, 2025 · Leetcode # 15. Skip Duplicates: After finding a triplet or moving a pointer, always skip the duplicate numbers to avoid duplicate triplets in the result. 3Sum. Return the maximum dot product between non-empty subsequences of nums1 and nums2 with the same length. . Solve one problem based on Data Structures and Algorithms every day and win exciting prizes. Constraints: 1 <= nums. I chose this algorithm because it's efficient and easy to implement. * For example, if nums = [2, 1], you can add a '+' before 2 and a '-' before 1 and concatenate them to build the expression "+2 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 Jun 3, 2022 · Question in brief: 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. Each squares[i] = [xi, yi, li] represents the coordinates of the bottom-left point and the side length of a square parallel to the x-axis. or Dec 26, 2023 · LeetCode 15. , nums [i] + nums [j] + nums [k] == 0), you can use a modified version of the “3Sum” algorithm. 3Sum Closest in Python, Java, C++ and more. Find the number of triplets (i, j, k) that meet the following conditions: * 0 <= i < j < k < nums. Return the maximum possible sum that can In this video, we'll are going to solve the question - Find the first missing positive number from the array. In this blog post, we … Apr 15, 2024 · Move these pointers based on the sum comparison. length * nums [i], nums [j], and nums [k] are pairwise distinct. Inside a nested loop, check if given sum - arr [i] - arr [j] is present in the hash set. Find all triplets with zero sum is also called 3Sum LeetCode challenge and in this video tutorial we learn how t Can you solve this real interview question? Maximum Product Subarray - Given an integer array nums, find a subarray that has the largest product, and return the product. A triplet {a, b, c} is considered a Pythagorean triplet if it satisfies the condition a2 + b2 = c2. The challenge is to ensure no duplicate triplets in the output Jan 8, 2026 · Can you solve this real interview question? Max Dot Product of Two Subsequences - Given two arrays nums1 and nums2. This is the 3Sum problem on LeetCode. Mar 3, 2024 · Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] where i, j and k are distinct and nums[i] + nums[j] + nums[k] == 0. Example 1: 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 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 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.

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