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Update all solutions' changes in 2025-04-24.
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‎en/1-1000/1-two-sum.md‎

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# 1. Two Sum - LeetCode solutions in Python/Java/C++ and more
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# 1. Two Sum - LeetCode Python/Java/C++/JS code
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Visit original link: [1. Two Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/1-two-sum) for a better experience!
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Visit original link: [1. Two Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/1-two-sum) for a better experience!
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LeetCode link: [1. Two Sum](https://leetcode.com/problems/two-sum), difficulty: **Easy**.
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1. In `Map`, `key` is `num`, and `value` is array `index`.
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2. Traverse the array, if `target - num` is in `Map`, return it. Otherwise, add `num` to `Map`.
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## Steps
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## Step by Step Solutions
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1. In `Map`, `key` is `num`, and `value` is array `index`.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [1. Two Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/1-two-sum).
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Original link: [1. Two Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/1-two-sum).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/15-3sum.md‎

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# 15. 3Sum - LeetCode solutions in Python/Java/C++ and more
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# 15. 3Sum - LeetCode Python/Java/C++/JS code
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Visit original link: [15. 3Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/15-3sum) for a better experience!
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Visit original link: [15. 3Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/15-3sum) for a better experience!
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LeetCode link: [15. 3Sum](https://leetcode.com/problems/3sum), difficulty: **Medium**.
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4. If you choose `option 1`, you need to use the `two pointers` algorithm when searching for the other two numbers.
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5. For `option 2`, only the `Python` sample code is given. This article focuses on `option 1`.
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## Steps
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## Step by Step Solutions
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1. Sort `nums`.
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2. Iterate over `nums`.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [15. 3Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/15-3sum).
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Original link: [15. 3Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/15-3sum).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/160-intersection-of-two-linked-lists.md‎

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# 160. Intersection of Two Linked Lists - LeetCode solutions in Python/Java/C++ and more
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# 160. Intersection of Two Linked Lists - LeetCode Python/Java/C++/JS code
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Visit original link: [160. Intersection of Two Linked Lists - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/160-intersection-of-two-linked-lists) for a better experience!
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Visit original link: [160. Intersection of Two Linked Lists - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/160-intersection-of-two-linked-lists) for a better experience!
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LeetCode link: [160. Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists), difficulty: **Easy**.
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3. At this time, repeat `node = node.next` on the two linked lists until the same node is found or one of the linked lists has reached the end.
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</p></details>
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## Steps
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## Step by Step Solutions
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1. First calculate the number of nodes in the two linked lists A and B. The number of nodes in linked list A is `node_count_a`, and the number of nodes in linked list B is `node_count_b`.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [160. Intersection of Two Linked Lists - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/160-intersection-of-two-linked-lists).
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Original link: [160. Intersection of Two Linked Lists - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/160-intersection-of-two-linked-lists).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/18-4sum.md‎

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# 18. 4Sum - LeetCode solutions in Python/Java/C++ and more
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# 18. 4Sum - LeetCode Python/Java/C++/JS code
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Visit original link: [18. 4Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/18-4sum) for a better experience!
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Visit original link: [18. 4Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/18-4sum) for a better experience!
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LeetCode link: [18. 4Sum](https://leetcode.com/problems/4sum), difficulty: **Medium**.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [18. 4Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/18-4sum).
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Original link: [18. 4Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/18-4sum).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/19-remove-nth-node-from-end-of-list.md‎

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# 19. Remove Nth Node From End of List - LeetCode solutions in Python/Java/C++ and more
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# 19. Remove Nth Node From End of List - LeetCode Python/Java/C++/JS code
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Visit original link: [19. Remove Nth Node From End of List - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/19-remove-nth-node-from-end-of-list) for a better experience!
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Visit original link: [19. Remove Nth Node From End of List - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/19-remove-nth-node-from-end-of-list) for a better experience!
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LeetCode link: [19. Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list), difficulty: **Medium**.
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3. When `index == node_count - n`, delete the node by `node.next = node.next.next`.
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4. Since the deleted node may be `head`, a virtual node `dummy_node` is used to facilitate unified processing.
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## Steps
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## Step by Step Solutions
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1. First find out `node_count`.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [19. Remove Nth Node From End of List - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/19-remove-nth-node-from-end-of-list).
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Original link: [19. Remove Nth Node From End of List - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/19-remove-nth-node-from-end-of-list).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/20-valid-parentheses.md‎

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# 20. Valid Parentheses - LeetCode solutions in Python/Java/C++ and more
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# 20. Valid Parentheses - LeetCode Python/Java/C++/JS code
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Visit original link: [20. Valid Parentheses - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/20-valid-parentheses) for a better experience!
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Visit original link: [20. Valid Parentheses - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/20-valid-parentheses) for a better experience!
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LeetCode link: [20. Valid Parentheses](https://leetcode.com/problems/valid-parentheses), difficulty: **Easy**.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [20. Valid Parentheses - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/20-valid-parentheses).
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Original link: [20. Valid Parentheses - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/20-valid-parentheses).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/202-happy-number.md‎

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# 202. Happy Number - LeetCode solutions in Python/Java/C++ and more
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# 202. Happy Number - LeetCode Python/Java/C++/JS code
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Visit original link: [202. Happy Number - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/202-happy-number) for a better experience!
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Visit original link: [202. Happy Number - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/202-happy-number) for a better experience!
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LeetCode link: [202. Happy Number](https://leetcode.com/problems/happy-number), difficulty: **Easy**.
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2. If `n` has already appeared, it means that the loop has been entered, and `return false`. You can use `Set` to save the `n` that has appeared.
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3. Go is the iterative solution, other languages are the recursive solution.
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## Steps
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## Step by Step Solutions
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1. Generate a new `n` as the `isHappy(n)` parameter.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [202. Happy Number - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/202-happy-number).
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Original link: [202. Happy Number - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/202-happy-number).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/203-remove-linked-list-elements.md‎

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# 203. Remove Linked List Elements - LeetCode solutions in Python/Java/C++ and more
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# 203. Remove Linked List Elements - LeetCode Python/Java/C++/JS code
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Visit original link: [203. Remove Linked List Elements - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/203-remove-linked-list-elements) for a better experience!
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Visit original link: [203. Remove Linked List Elements - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/203-remove-linked-list-elements) for a better experience!
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LeetCode link: [203. Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements), difficulty: **Easy**.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [203. Remove Linked List Elements - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/203-remove-linked-list-elements).
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Original link: [203. Remove Linked List Elements - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/203-remove-linked-list-elements).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/206-reverse-linked-list.md‎

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# 206. Reverse Linked List - LeetCode solutions in Python/Java/C++ and more
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# 206. Reverse Linked List - LeetCode Python/Java/C++/JS code
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Visit original link: [206. Reverse Linked List - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/206-reverse-linked-list) for a better experience!
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Visit original link: [206. Reverse Linked List - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/206-reverse-linked-list) for a better experience!
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LeetCode link: [206. Reverse Linked List](https://leetcode.com/problems/reverse-linked-list), difficulty: **Easy**.
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<details><summary>Click to view the answer</summary><p>It is `while (current != null)`, because the operation to be performed is `current.next = previous`.</p></details>
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## Steps
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## Step by Step Solutions
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1. Traverse all nodes.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [206. Reverse Linked List - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/206-reverse-linked-list).
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Original link: [206. Reverse Linked List - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/206-reverse-linked-list).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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‎en/1-1000/209-minimum-size-subarray-sum.md‎

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# 209. Minimum Size Subarray Sum - LeetCode solutions in Python/Java/C++ and more
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# 209. Minimum Size Subarray Sum - LeetCode Python/Java/C++/JS code
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Visit original link: [209. Minimum Size Subarray Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/209-minimum-size-subarray-sum) for a better experience!
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Visit original link: [209. Minimum Size Subarray Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/209-minimum-size-subarray-sum) for a better experience!
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LeetCode link: [209. Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum), difficulty: **Medium**.
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For **subarray** problems, you can consider using **Sliding Window Technique**, which is similar to the **Fast & Slow Pointers Approach**.
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## Steps
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## Step by Step Solutions
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1. Iterate over the `nums` array, the `index` of the element is named `fastIndex`. Although inconspicuous, this is the most important logic of the *Fast & Slow Pointers Approach*. Please memorize it.
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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit website [LeetCodePython.com](https://leetcodepython.com): Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!
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Original link: [209. Minimum Size Subarray Sum - LeetCode solutions in Python/Java/C++ and more](https://leetcodepython.com/en/leetcode/209-minimum-size-subarray-sum).
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Original link: [209. Minimum Size Subarray Sum - LeetCode Python/Java/C++/JS code](https://leetcodepython.com/en/leetcode/209-minimum-size-subarray-sum).
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GitHub repository: [f*ck-leetcode](https://github.com/fuck-leetcode/fuck-leetcode).
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