Triplet Sum In Array Leetcode. Follow our clear and concise explanation to understand the approach

Follow our clear and concise explanation to understand the approach and code for this problem. Jan 13, 2026 · Can you solve this real interview question? Separate Squares I - You are given a 2D integer array squares. 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. 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. 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'. 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. . 3Sum Closest in Python, Java, C++ and more. length * nums [i], nums [j], and nums [k] are pairwise distinct. Note that the product of an array with a single element is the value of that element. Given an integer n, return the number of square triples such that 1 <= a, b, c <= n. I recommend you first solve Two Sum and/or Two Sum 2 prior to this. The test cases are generated so that the answer will fit in a 32-bit integer. Given an array of integers, Write a code to find all unique triplets in the array which gives the sum of zero. 3Sum is a Leetcode medium level problem. 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. length <= 1000 May 30, 2024 · I tackled LeetCode problem 15: 3Sum, to find all unique triplets in an array that sum up to zero. Inside a nested loop, check if given sum - arr [i] - arr [j] is present in the hash set. are triplets. Count Triplets That Can Form Two Arrays of Equal XOR in Python, Java, C++ and more. In-depth solution and explanation for LeetCode 16. Sep 8, 2019 · Given the array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0. Mar 26, 2022 · Leetcode 15–3Sum This article will cover and explain a solution to the Leetcode problem 3Sum. 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. 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. 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. Problem link: https://practice. 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. length). Oct 6, 2024 · Given an array nums of n integers, the task is to find all unique triplets (i. 3Sum in Python, Java, C++ and more. 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. Mar 30, 2024 · The Three sum problem series is an extension of Two Sum problem as constructed in this a previous article. 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. 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. 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. 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. For example, if nums= [1,2, 3,4] is the given array, [1,2,3] [2,3,4] [1,3,4] etc. In this blog post, we … Apr 15, 2024 · Move these pointers based on the sum comparison. 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]. geeksforgeeks. 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. This is the best place to expand your knowledge and get prepared for your next interview. Can you solve this real interview question? Target Sum - You are given an integer array nums and an integer target. 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. Hence, the answer is 0. Return true if such a triplet exists, otherwise, return false. 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. 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. Skip Duplicates: After finding a triplet or moving a pointer, always skip the duplicate numbers to avoid duplicate triplets in the result. Additionally, increment j and decrement k while skipping duplicate values to avoid duplicate triplets. 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. 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]). 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. or Dec 26, 2023 · LeetCode 15. Your task is to choose exactly three integers from nums such that their sum is divisible by three. We can return triplets in any order, but all the returned triplets should be internally sorted, i. Nov 20, 2020 · The most trivial approach would be to find all triplets of the array and count all such triplets whose ‘SUM’ = 'K'. 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. Given an array arr[] and an integer target, determine if there exists a triplet in the array whose sum equals the given target. If no such triplet exists, return 0. Next, we enumerate the first element of the triplet n u m s [i], where 0 ≤ i <n 2. * 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. 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. 3Sum 💥 Given an array of integers, find all unique triplets which sum to zero. Nov 30, 2023 · If sum is equal to 0, add the triplet [nums[i], nums[j], nums[k]] to the result list. The solution set must not contain duplicate triplets and the order of the output and the order of the triplets does not matter. 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]. Dec 15, 2015 · 3 <= nums. 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. 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. 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. Aug 13, 2024 · Mastering Leetcode Problem-Solving Using Simple JavaScript. We want to select three indices i, j and k where (0 <= i < j <= k < arr. Intuitions, example walk through, and complexity analysis. 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. 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. 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. Ideal for coding interviews and skill development. If no such triplet exists, return -1. 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? Maximize Y‑Sum by Picking a Triplet of Distinct X‑Values - You are given two integer arrays x and y, each of length n. Check for Zero Sum: If the sum of the numbers at the two pointers with the fixed number is zero, record the 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 In this post, we are going to solve the 15. Better than official and forum solutions. Jan 24, 2022 · Let us try to understand the problem statement. Apr 15, 2024 · Move these pointers based on the sum comparison. 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. 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). A subarray is a contiguous part of an array. 3Sum. 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. 3 days ago · The Strategy My approach was to use the two-pointer technique. Find all unique triplets in the array which gives the sum of zero. , three numbers) in the array which sum to zero. 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. 3Sum provides an unsorted list of integers and asks that you find all unique triplets Tagged with leetcode, algorithms, javascript, tutorial. 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. Use this 2-minute decision checklist and a cheat sheet of the 12 core algorithm patterns (with signals, templates, and common traps). 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. Notice that the solution set must not contain duplicate triplets. 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. I chose this algorithm because it's efficient and easy to implement. The solution set must not contain duplicate triplets. In this video, we'll are going to solve the question - Find the first missing positive number from the array. Find the number of triplets (i, j, k) that meet the following conditions: * 0 <= i < j < k < nums. Constraints: 1 <= nums. 3Sum problem of Leetcode. In-depth solution and explanation for LeetCode 15. Solve one problem based on Data Structures and Algorithms every day and win exciting prizes. Note: If there are multiple sums closest to target, print the maximum one. If yes, then print the 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 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]. e. Return the maximum dot product between non-empty subsequences of nums1 and nums2 with the same length. , for any triplet [q1, q2, q3], the condition q1 ≤ q2 ≤ q3 should hold. 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. This is the 3Sum problem on LeetCode. 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. 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 this blog… Dec 15, 2023 · Output: 4 Explanation: Any triplet chosen here has a sum of 9, which is divisible by 3. 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]. Number of Divisible Triplet Sums in Python, Java, C++ and more. 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. 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. Given an array of integers, write a code to find all unique triplets with zero sum. I sorted the array first, which made it easier to find the triplets. Intuition to solving these… Aug 13, 2024 · Mastering Leetcode Problem-Solving Using Simple JavaScript. Hence, the answer is the total number of triplets which is 4. 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. You need to find the number of good triplets. 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. , nums [i] + nums [j] + nums [k] == 0), you can use a modified version of the “3Sum” algorithm. A triplet is nothing but a set of three numbers in the given array. Jul 23, 2025 · Given an array of positive integers, the task is to determine if a Pythagorean triplet exists in the given array. 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. 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]. 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. A triplet {a, b, c} is considered a Pythagorean triplet if it satisfies the condition a2 + b2 = c2. Dec 23, 2022 · In this problem, you must find all unique triplets in an array that sum up to a specific target value. 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. 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. Return the maximum possible sum of such a triplet. 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. 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. Let's see code, 15. Example 1: Input: nums = [2,3,-2,4] Output: 6 Explanation: [2 . 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. Example 1: Jul 8, 2025 · The goal sounds simple enough: find all unique triplets in an array that sum up to zero. A good triplet is a set of 3 distinct values which are present in increasing order by position both in nums1 and nums2. This problem 15. 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. 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. 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. In-depth solution and explanation for LeetCode 1442.

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