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4 Sum Problem, Can you solve this real interview question? Two Sum I
4 Sum Problem, Can you solve this real interview question? Two Sum II - Input Array Is Sorted - Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. Combination Sum IV - Given an array of distinct integers nums and a target integer target, return the number of possible combinations that add up to target. 99K subscribers 251 10K views 4 years ago https://leetcode. Jan 20, 2024 · 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. 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. In this article, we have explored an insightful approach/ algorithm to find the 4 elements in an array whose sum is equal to the required answer (4 Sum problem). Problem Description You are given an array nums containing n integers and a target value. Dec 23, 2022 · 4Sum. No Download or Signup. e for any quadruple [q1, q2, q3, This video explains a very important programming interview problem which is the 4 sum problem. Mar 12, 2025 · In competitive programming, solving the 4Sum problem efficiently is a classic challenge that tests your understanding of algorithms and data structures. Follow our clear and concise explanation to understand the approach and code for Practice addition, multiplication, fractions and algebraic reasoning with our popular math games. 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 Aug 13, 2025 · We have discussed how to find if a quadruple with given sum exists or not in an array. May 17, 2024 · This problem is a specific case of the k-sum problem, particularly focusing on the 4-sum problem. Nov 10, 2020 · In the three sum problem, we iterate through the elements in the array and use the two pointer approach to search the other two elements. The 4Sum problem challenges you to find all unique quadruplets in an array that sum to a specific target. We explore various approaches to find all unique quadruplets in an array that sum to a given target. Unlike the simpler 2Sum and 3Sum problems, this version requires considering four elements, making efficiency and duplicate handling critical. Calculate dice probability to throw a given number exactly, or throw less than or greater than a certain face value 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. Calculates dice roll probability, such as throwing two (6-sided) dice and having a certain sum of their faces.
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