Contains Duplicate - Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. There is only one repeated number in … Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. The time complexity is O(nlogn). 📌 Find the Duplicate Number | LeetCode Explained In this video, we solve the Find the Duplicate Number problem from LeetCode. Dec 26, 2022 · But we could use the same concept from the solution of Find the Duplicate Number — Leetcode 287, find the duplicate with the same method but instead of the return value, we store it as a valuable. For each kind of duplicate subtrees, you only need to return the root node of any one of them. For more questions and solutions, you can see my LintCode repository. x], otherwise the duplicate number must be in [x + 1,. You are given an array containing n + 1 integers where each number Comprehensive study plan with weekly LeetCode problems covering Two Pointers, Sliding Window, Binary Search, and more. Find the Duplicate Number Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. LeetCode Problems' Solutions . Example 1: Input: nums = [1,3,4,2,2] Output Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. This repository is used to share my solutions for LeetCode problems. You must implement a solution with a linear runtime complexity and use only constant extra space. Remember, coding is not just about finding the solution; it's about finding the best solution. x] is greater than x, then the duplicate number must be in [1,. Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. Nov 10, 2024 · 🚀 Solving LeetCode Question 287 - Find the Duplicate Number | Coding Interview Prep Description: 👋 Welcome to CodeBash! Today, we're tackling an essential problem from LeetCode, Find the Find the Duplicate Number - Floyd's Cycle Detection - Leetcode 287 - Python NeetCode 1M subscribers Subscribe Mar 24, 2024 · It is a problem of finding duplicate numbers in an array. Learn brute force, sum-set approach, and optimal methods with detailed explanations Hi, I'm currently grinding Linked Lists topic from Neetcode 150 and one of the recent problems was Find the Duplicate Number. Here, 1 1 can be placed in index 0 0, like wise shift all the numbers one by one, at last, in the last index we will be having the duplicate number. Example 1: Input: nums = [1,3,4,2,2] Output Sep 19, 2023 · Leetcode 287: Find the Duplicate Number [Medium] Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. Find Duplicate Subtrees - Given the root of a binary tree, return all duplicate subtrees. x] is greater than x at each Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. . LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Example 1: Input: nums = [1,3,4,2,2] Output LeetCode Daily - Day 17: Find the Duplicate Number This is one of those tricky questions that most people get wrong. We are given an array containing n + 1 integers where each integer is in the range 1 to n And we have to return the duplicate number but here’s the twist, the number can repeat more than once. txt) or read online for free. 👀 Full problem + solution walkthrough in the PDF below. Example 1: Input: nums = [1,3,4,2,2] Output Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Learn sorting, transforming, and reshaping data using Python. Assume that there is only one duplicate number, find the duplicate one. I'll keep updating for full summary and better solutions. As soon as I read the description, I knew that I can simply use bit manipulation to achieve O (n) time and O (1) space complexity. I added several solutions to the source repository Must-do List for Interview Prep Find First and Last Position of Element in Sorted Array Java solution for most popular Leetcode questions - GitHub - Gaurav9969351313/GT-FAANG-Java-Solution: Java solution for most popular Leetcode questions How to find your question ? You can easily find the solution for your question, just press CTRL+F and search either using the question number or you can enter the topic of your question from LeetCode. Find that single one. Find the Duplicate Number LeetCode Solution - Given an array of integers nums containing n + 1, find the repeated number. If we consider just the positive counts (seen at positions 0 and 1), this, again is the equivalent of the number 333, which is the duplicate number. Find the Duplicate Number LeetCode solution in Python, Java, C++, JavaScript, and C#. Different solutions Iterate through the list and sort it, and then find if two adjacent nums are equal and return one of those nums. Optimized approach using Floyd's cycle detection algorithm with O (n) time and O (1) space complexity. Ideal for coding interviews and skill development. 3. Otherwise, insert the number into seen. There is only one repeated number in nums, return this repeated number. Leetcode all problems list, with company tags and solutions. Is it possible to solve it without any extra space and O(n) time? Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. 2. When there are 1 to n-1, a number There is only one repeated number in nums, return this repeated number. Solved them using Java, Python, and C languages. May 17, 2025 · Find the duplicate number in an array efficiently using Floyd’s Tortoise and Hare cycle detection. You must solve the problem without modifying the array nums and uses only constant extra space. If we fix one of the numbers say x, we are left with the two-sum problem at hand! 1. Find All Duplicates in an Array - Given an integer array nums of length n where all the integers of nums are in the range [1, n] and each integer appears at most twice, return an array of all the integers that appears twice. Java solution for most popular Leetcode questions - GitHub - rhayannematos/java-solution: Java solution for most popular Leetcode questions Solution to LeetCode 💻 Algorithms problems. Contribute to pawanyadav2706/leetcode development by creating an account on GitHub. Therefore, we can use binary search to find x, and check whether the number of elements in [1,. The relative order of the elements should be kept the same. There is only one duplicate number. Contribute to franklingu/leetcode-solutions development by creating an account on GitHub. Example 1: Input: nums = [1,3,4,2,2] Output May 2, 2025 · By Long Luo This article is the solution 9 Approaches：Brute Force, Count, Hash, In-place Marked, Sorting, Index Sort, Binary Search, Bit Manipulation, Fast Slow Pointers of Problem 287. Example 1: Input: nums = [1,3,4,2,2] Output I recently solved this using a window-function-based approach that turns a tricky date problem into a clean analytical solution. Better than official and forum solutions. Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. You must solve the problem without modifying the array nums and using only constant extra space. Example 1: Input: nums = [1,3,4,2,2] Output Find the duplicate number (LeetCode 287) | Full solution with different methods | Study Algorithms Nikhil Lohia 77. Solutions for LeetCode. In this article, we’ll explore a unique approach to this problem and provide a Java solution. xls / . If no duplicate is found (should not happen in this problem), return -1. Stay tuned for updates. 3K subscribers Subscribed Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. We've explored the importance of this problem in the coding world, understood its requirements, and learned a clever algorithm to crack it efficiently. Example 1: Input: nums = [1,3,4,2,2] Output Apr 8, 2022 · Team CB brings you a series of solutions and explanations of Top Interview Questions on LeetCode. Store the seen nums in another list, and then return num if the num is already in seen. LeetCode The number of LeetCode questions is increasing every week. Example 1: Input: nums = [1,2,3,1] Output: true Explanation: The element 1 occurs at the indices 0 and 3. Example 1: Input: nums = [1,3,4,2,2] Output Explore a curated list of algorithm problems from LeetCode, categorized by data structures and difficulty levels, ideal for interview preparation. Dec 24, 2025 · Master data manipulation in Pandas with practical examples and LeetCode problems. After they meet, you must start a new pointer from index 0 and move both pointers one step at a time until they meet again. Contribute to eminenceG/leetcode-1 development by creating an account on GitHub. doc / . docx), PDF File (. Find the Duplicate Number Leetcode Solution Find the Duplicate Number Leetcode Problem : Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. xlsx), PDF File (. Algorithm Create an empty hash set seen. If you'd like to share your solution for feedback and ideas, please head to the solutions tab and post it there. ) MohamedOsamaa74 / LeetCode-Solutions Public Notifications You must be signed in to change notification settings Fork 0 Star 0 Leetcode Solution using Javascript. Example 1: Input: nums = [1,3,4,2,2] Output This repository is used to share my solutions for LeetCode problems. pdf), Text File (. leetcode is very problem solving and code. Find the Dupli Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. So, we essentially need to find three numbers x, y, and z such that they add up to the given value. Example 1: Input: nums = [1,3,4,2,2] Output A curated collection of LeetCode solutions in Java, featuring clean code, optimal algorithms, and helpful comments. In the fast and slow pointer approach, the meeting point of the two pointers is not the duplicate number. LeetCode 50 Questions - Free download as Word Doc (. Sep 12, 2016 · Solutions Solution 1: Binary Search We can observe that if the number of elements in [1,. In-depth solution and explanation for LeetCode 287. The problem discussion is for asking questions about the problem or for sharing tips - anything except for solutions. These are the DSA questions frequently asked in the coding Mar 6, 2021 · Given an array of positive integers, find all the duplicates. Mar 24, 2024 · It is a problem of finding duplicate numbers in an array. Find the Duplicate Number in Python, Java, C++ and more. Example 1: Input: nums = [1,3,4,2,2] Output Contains Duplicate II - Given an integer array nums and an integer k, return true if there are two distinct indices i and j in the array such that nums [i] == nums [j] and abs (i - j) <= k. Example 1: Input: nums = [1,3,4,2,2] Output Can you solve this real interview question? Find All Duplicates in an Array - Given an integer array nums of length n where all the integers of nums are in the range [1, n] and each integer appears at most twice, return an array of all the integers that appears twice. Example 1: Input: s = "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 1: Input: nums = [1,3,4,2,2] Output Contains Duplicate - Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once. A set gives constant-time lookup, so this approach is simple and efficient. In-depth solution and explanation for LeetCode 287. Can you solve this real interview question? Single Number - Given a non-empty array of integers nums, every element appears twice except for one. The difficulties of these problems range from easy to medium to hard. Intuitions, example walk through, and complexity analysis. (Notes: "📖" means you need to subscribe to LeetCode premium membership for the access to premium questions. I solved it using a binary search. Oct 21, 2023 · LeetCode’s “Find the Duplicate Number” challenge (#287) encapsulates this challenge. Loop through each number in the array: If the number is already in seen, return it (this is the duplicate). Time complexity: O (n) O(n), where n is the number of elements in the array Space complexity: O (1) O(1) Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without duplicate characters. Example 1: Input: nums = [1,3,4,2,2] Output Find the Duplicate Number Leetcode Solution Find the Duplicate Number Leetcode Problem : Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. Example 1: Input: nums = [1,3,4,2,2] Output Sep 2, 2020 · There is only one duplicate number in the list. Please don't post any solutions in this discussion. - anand-s Jul 31, 2024 · In this Leetcode Find the Duplicate Number problem solution we have given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. When there are 1 to n-1, a number Nov 10, 2024 · 🚀 Solving LeetCode Question 287 - Find the Duplicate Number | Coding Interview Prep Description: 👋 Welcome to CodeBash! Today, we're tackling an essential problem from LeetCode, Find the Dec 26, 2022 · But we could use the same concept from the solution of Find the Duplicate Number — Leetcode 287, find the duplicate with the same method but instead of the return value, we store it as a valuable. Can you solve this real interview question? Missing Number - Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array. n]. Mar 24, 2024 · Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. Jul 31, 2024 · In this Leetcode Find the Duplicate Number problem solution we have given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. Also, follow up note to the problem Space complexity should be O (1 Sep 20, 2023 · Conclusion So, there you have it – the mystery of LeetCode 287, "Find the Duplicate Number" unveiled. - anand-s Leetcode DSA Question Sheet - Free download as Excel Spreadsheet (. The upper bound for n is 10 5, so there is no integer overflow problem. So shift all numbers to the exact index (num - 1) positions and find the duplicate. Perfect for DSA revision, technical interviews, and leveling up your problem-solving skills.

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