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Questions and Answers
Which method is commonly used for detecting cycles in a linked list?
Which method is commonly used for detecting cycles in a linked list?
The sliding window technique can be used to find a maximum value in an array.
The sliding window technique can be used to find a maximum value in an array.
True
What is the primary purpose of the 'remove duplicates' operations in arrays?
What is the primary purpose of the 'remove duplicates' operations in arrays?
To eliminate repeated elements and reduce the size of the dataset.
The two-pointer technique is typically used to traverse a linked list or an array by employing a ____ pointer and a ____ pointer.
The two-pointer technique is typically used to traverse a linked list or an array by employing a ____ pointer and a ____ pointer.
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Match the problem to its corresponding technique:
Match the problem to its corresponding technique:
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What does the 'rotate list' problem involve?
What does the 'rotate list' problem involve?
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Cyclic detection can be performed only with linked lists.
Cyclic detection can be performed only with linked lists.
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What is a common application of the sliding window method in problem-solving?
What is a common application of the sliding window method in problem-solving?
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Which of the following algorithms is primarily used for merging two sorted arrays?
Which of the following algorithms is primarily used for merging two sorted arrays?
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All substring problems can be solved using the sliding window technique.
All substring problems can be solved using the sliding window technique.
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What is the purpose of the find-median-from-data-stream problem?
What is the purpose of the find-median-from-data-stream problem?
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The operation of __________ involves detecting cycles in a linked list.
The operation of __________ involves detecting cycles in a linked list.
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Which problem involves partitioning an array to minimize the sum difference?
Which problem involves partitioning an array to minimize the sum difference?
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Match the following problems with their appropriate categories:
Match the following problems with their appropriate categories:
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Which technique is typically used to solve problems involving finding unique or common elements in arrays?
Which technique is typically used to solve problems involving finding unique or common elements in arrays?
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The two-pointer technique can only be applied to sorted arrays.
The two-pointer technique can only be applied to sorted arrays.
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What is the primary purpose of the two-pointer technique in algorithms?
What is the primary purpose of the two-pointer technique in algorithms?
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The Trapping Water problem can be solved using the two-pointer technique.
The Trapping Water problem can be solved using the two-pointer technique.
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Name one problem that utilizes the slow and fast pointer technique.
Name one problem that utilizes the slow and fast pointer technique.
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The problem involving determining the __________ of elements that meet a specified sum condition is part of the two-pointer category.
The problem involving determining the __________ of elements that meet a specified sum condition is part of the two-pointer category.
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Match the following two-pointer techniques with their applications:
Match the following two-pointer techniques with their applications:
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Which of the following is NOT a category associated with the two-pointer technique?
Which of the following is NOT a category associated with the two-pointer technique?
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The problem of minimizing the maximum pair sum requires a clear understanding of array manipulation.
The problem of minimizing the maximum pair sum requires a clear understanding of array manipulation.
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What common misconception might someone have about the usage of two pointers?
What common misconception might someone have about the usage of two pointers?
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The __________ is a common example of a problem solved using the two-pointer approach to find an optimal arrangement.
The __________ is a common example of a problem solved using the two-pointer approach to find an optimal arrangement.
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Which problem is typically used as an example to illustrate the concept of running two pointers from both ends?
Which problem is typically used as an example to illustrate the concept of running two pointers from both ends?
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Study Notes
Two Pointer Problem Categories and Examples
- Two pointer problems are common in technical interviews, and there are around 140 problems on LeetCode.
- The majority of these problems are easy or medium difficulty.
- The notes categorize the 117 solved LeetCode problems into four main categories.
Running from Both ends of an Array
- Two pointers start at the beginning and end of the array and move towards the center.
- Example problems:
- Two Sum II - Input Array is Sorted
- Trapping Rain Water
- Next Permutation
- Reverse String
Slow & Fast Pointers
- Two pointers move at different speeds, typically from the left end.
- The fast pointer provides information to the slow pointer for processing.
- Example problem categories :
- Linked List Operations
- Cyclic Detection
- Sliding Window/Caterpillar Methods
- Rotation
- String Manipulation
- Remove Duplicates
Running from Beginning of 2 Arrays/Merging 2 Arrays
- Involves two pointers iterating through two given arrays or lists.
- Example problem categories:
- Sorted Arrays
- Intersections/LCA-like
- Substring
- Median Finder
- Meet-in-the-middle/Binary Search
Split & Merge of the Array/Divide & Conquer
- First, split the given list into two separate lists, then apply two pointers to merge or unify them.
- Example problem categories:
- Partition
- Sorting
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Description
Explore the main categories of two pointer problems commonly encountered in technical interviews. This quiz covers a range of examples from various problem types like running from both ends of an array and using slow & fast pointers. Test your knowledge and understanding of these effective problem-solving techniques.
