Can you solve this real interview question? Count Good Numbers - A digit string is good if the digits (0-indexed) at even indices are even and the digits at odd indices are prime (2, 3, 5, or 7). Explanation: The only possible triplet sums up to 0. Your task is to return all pairs of elements such that they add takeuforward is the best place to learn data structures, algorithms, most asked coding interview questions, real interview experiences free of cost. You are given an array Arr consisting of N integers, you need to find all the distinct triplets present in the array which ad Practice three sum coding problem. The idea is to traverse every element arr [i] in a loop. 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. In this repo, you can find all python problems for the Coding Ninja Fundamental course of 2021-22. You are given an array of integers 'ARR' of length 'N' and an integer Target. The Apr 15, 2024 · Learn how to efficiently solve the popular LeetCode 3Sum problem, ensuring no duplicate triplets. You have been given an array 'ARR' of integers consisting of ‘N’ integers and a positive integer ‘K’. , nums [i] + nums [j] + nums [k] == 0), you can use a modified version of the “3Sum” algorithm. Given an array&nbsp;arr[]&nbsp;and an integer&nbsp;target, the task is to find the sum of three integers in&nbsp;arr[]&nbsp;such that the sum is closest to&nbsp;target. For the second test case, there are two valid pairs (-1,2) and (-1,2), which add up to 1. Given a number N, print sum of all even numbers from 1 to N The 3 Sum problem finds all unique triplets in an array that sum up to a target value, ensuring no duplicate triplets are returned Dec 16, 2021 · Practice ninja’s training coding problem. io/ - A better way to prepare for Coding Interviews 🧑‍💼 LinkedIn: / navdeep-singh-3aaa14161 more 3 Sum | Brute - Better - Optimal with Codes take U forward 970K subscribers Subscribed 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. STEP 2: The function first checks the size of the ‘nums’ vector. So, we essentially need to find three numbers x, y, and z such that they add up to the given value. Two Sum. Constraints : 1 <= t <= 50 0 <= N <= 10^2 0 <= X <= 10^9 Time Limit: 1 sec Sample Input 1: 1 7 1 2 3 4 5 6 7 12 Sample Output 1: 5 Sample Input 2: 2 7 1 2 3 4 5 6 7 19 9 2 -5 8 -6 0 5 10 11 -3 10 Sample Output 2: 0 5 Explanation for Input 2: Since there doesn't exist any triplet with sum equal to 19 for the first query, we print 0. Solutions to problems encountered in Coding Ninjas' Introduction to Java Course - sa1123/Coding-Ninjas-Java Practice subset sum coding problem. Note: If there are multiple sums closest to target, print the maximum one. In short, you need to return an array of all the unique triplets [arr[a Nov 12, 2020 · Practice closest sum coding problem. Triplets with Given Sum. - Coding-ninjas-competitive/3 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 20, 2020 · Practice 3sum coding problem. If we fix one of the numbers say x, we are left with the two-sum problem at hand! To efficiently find the j and k pairs, we run the two pointer approach on the elements to the right of index i as the array is sorted. - rajdip20/Coding-Ninja-Python_Fundamentals Nov 20, 2020 · Practice 3sum coding problem. Sorting Jul 30, 2023 · 3 Sum Solution Explained Visually Step by step explanation of 3Sum solution with Python code Problem Description Given an integer array nums, the task is to find all unique triplets [nums [i] … May 25, 2022 · Practice combination sum iii coding problem. Nov 20, 2020 · Practice 3sum coding problem. Let’s break it down step by step. Mar 6, 2021 · Make a “sum” variable that will contain the sum of different combinations. If the sum is equal to target, return true. Two combinations are unique if the 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 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 15. e. Dec 26, 2024 · The “3Sum” problem is a classic interview question and an excellent test of problem-solving skills in array manipulation and algorithm optimization. Here’s the approach: Jan 2, 2025 · Top Interview 150 The 3Sum problem is a classic interview challenge that combines sorting, Tagged with javascript, programming, leetcode, interview. 3SUM Problem a classic problem in computer science and is often used in coding interviews to test problem-solving skills and understanding of algorithms. -through-java development by creating an account on GitHub. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & This will have all the solutions to the competitive programming course&#39;s problems by Coding ninjas. Aug 13, 2025 · Explanation: No triplet in the array sums to 24. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & check 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. Otherwise, return false. For example If N=3 and array elements are [1,2]. Run three nested loops to find different combinations of i 3’s, j 4’s and k 5’s where i < X, j < Y and k < Z. 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? 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. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & chec Triplets with Given Sum. The same number may be chosen from candidates an unlimited number of times. However, "3245" is not good because 3 is at an even index but Nov 20, 2020 · Practice 3sum coding problem. . You have to find the sum of all the subsets in the non-decreasing order of the given array. Examp For the first test case, we can see that the sum of 2 and 7 is equal to 9 and it is the only valid pair. &nbsp; Note: If multiple sums are closest to target, return the maximum one. 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 Sep 25, 2019 · 3Sum Problem - No Duplicates Given an array nums of n integers, are there elements a, b, c Tagged with javascript, beginners, algorithms, ruby. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & check your You are given an array/list ARR consisting of N integers. The 3Sum (LeetCode 15) problem is a classic algorithm challenge often encountered in software engineering interviews, particularly at companies like Google, Facebook, and Amazon. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & check Top 100 Array Coding Problems Solutions | Coding Ninjas Platform #array #placement #coding #codingninja #leetcode #twosum Two Sum Problem Link : https://www. You may return the combinations in any order. 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. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & check your Mar 18, 2024 · Learn about two solutions to the integer 3Sum problem. 3Sum with Python, JavaScript, Java and C++, LeetCode #15! In this video, we delve into the '3Sum' problem, a classic programming challenge in the realm of algorithms and data structures. Aug 1, 2023 · STEP 1: We have ‘nums’ vector as input and returns a vector of vectors representing the triplets that sum up to zero. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexity & check Nov 20, 2020 · Practice 3sum coding problem. Star the repo if you like it. Your task is to find a subarray (contiguous) of size ‘K’ such that the sum of its elements is minimum. Following are the subset sums: 0 (by considering empty subset) 1 2 1+2 = 3 So, subset sum are [0,1,2,3]. A simple method is to generate all possible triplets and compare the sum of every triplet with the given target. Jul 23, 2025 · We have discussed one more approach, that works for sorted arrays, in the post 3 Sum - Count Triplets With Given Sum In Sorted Array. Practice 4sum coding problem. Note : You can assume that the value of ‘K’ will always be less than or equal to ‘N’. This blog post addresses the Three Number Sum (3Sum) problem, a more complex variant of the Two Number Sum problem. The goal is to find all triplets in an array that sum up to a given target value. Contribute to suchimaheshwari/Coding-ninjas-data-st. 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. Make use of appropriate data structures & algorithms to optimize your solution for time & space complexit You are given an array of ‘N’ integers. Nov 20, 2020 · Practice 3sum coding problem. 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. For the first test case, we can see that the sum of 2 and 7 is equal to 9 and it is the only valid pair. 🚀 https://neetcode. Your task is to find all the distinct triplets present in the array which adds up to a given number K. So, the answer will always exist. You are given an array Arr consisting of N integers, you need to find all the distinct triplets present in the array which ad Nov 24, 2022 · Practice three sum coding problem. * For example, "2582" is good because the digits (2 and 8) at even positions are even and the digits (5 and 2) at odd positions are prime. An array is said to have a triplet {ARR [i], ARR [j], ARR [k]} with sum = 'K' if there exists three indices i, j and k such that i!=j, j!=k and i!=j and ARR [i] + ARR [j] + ARR [k] = 'K'.

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