LeetCode Solutions Quiz

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Questions and Answers

What is the time complexity of the intermediate array method for rotating an array?

O(n*k) (correct)

O(k)

O(n)

O(n + k)

In the reversal method for rotating an array, which of the following is the correct first step?

Divide the array into two parts and reverse each part. (correct)

Check if the order is greater than the array's length.

Complete the rotation by using an intermediate array.

Rotate the entire array after reversing the sections.

What is the significance of using 'k % nums.length' when rotating the array?

It allows the array to be reversed directly.

It ensures that k is always positive.

It avoids unnecessary rotations when k is larger than n. (correct)

It handles cases where the array length is zero.

What would happen if 'order' is negative in the reversal method?

An IllegalArgumentException will be thrown. Signup and view all the answers

Which of the following statements about the memory usage of the intermediate array method is true?

It requires O(n) additional space for a new array. Signup and view all the answers

Which problem involves finding the maximum product of a subarray?

Max Product Subarray Signup and view all the answers

Which algorithm would you use to rearrange the elements of an array based on their median?

Median of Two Sorted Arrays Signup and view all the answers

Which of the following problems specifically deals with validating the structure of a binary search tree?

Validate Binary Search Tree Signup and view all the answers

What is the main objective of the 'Spiral Matrix' problem?

Extract elements in a spiral order Signup and view all the answers

Which problem addresses the challenge of determining the longest substring without repeating characters?

Longest Substring Without Repeating Characters Signup and view all the answers

Which problem involves finding the peak element in an array?

Find Peak Element Signup and view all the answers

In which problem are you required to evaluate reverse Polish notation?

Evaluate Reverse Polish Notation Signup and view all the answers

Which algorithm focuses on converting a sorted array into a height-balanced binary search tree?

Convert Sorted Array to Binary Search Tree Signup and view all the answers

Which problem allows for multiple transactions to maximize profit in stock trading?

Best Time to Buy and Sell Stock II Signup and view all the answers

Which solution addresses duplications in a sorted array by removing duplicates in place?

Remove Duplicates from Sorted Array Signup and view all the answers

Study Notes

LeetCode Solutions Overview

Program Creek Version 0.0 contains solutions to various algorithmic problems.
Divided into multiple sections, each addressing distinct coding challenges.

Array Manipulation

Problem: Rotate an array of n elements to the right by k steps.
Example given: For n = 7 and k = 3, array [1,2,3,4,5,6,7] becomes [5,6,7,1,2,3,4].

Solution Methodologies

Solution 1 - Intermediate Array

Create a new array to hold rotated elements.
Use System.arraycopy() to transfer elements.
Time complexity is O(n*k), which can be inefficient.

Solution 2 - In-Place Rotation

Involves manipulating the original array rather than creating a new one.
Utilizes a loop to swap elements directly within the array.
May improve space efficiency, but retains high time complexity.

Solution 3 - Reverse

A more optimal method achieving O(1) space and O(n) time complexity.
Steps involved:
- Split the array into two parts.
- Reverse the first part and then the second part.
- Finally, reverse the entire array to achieve the desired rotation.
The process can effectively minimize memory usage while ensuring performance efficiency.

Implementation Example

Code snippet demonstrates reversing segments of the array:
- Adjust the order using order = order % arr.length.
- Validate input for array and order constraints.
- Use a helper method to perform the reversing actions efficiently.

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Description

Test your understanding of various coding problems as featured in LeetCode Solutions. This quiz covers topics ranging from array manipulation in Java to advanced data structure designs. Challenge yourself with questions on palindrome substrings, interval merging, and more!