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Given a singly linked list, we need to rearrange its nodes so that even and odd numbers come one after the other alternatively. If the list starts with an even number, the next should be odd, then even, and so on. Similarly, if it begins with an odd number, the next should be even, then odd, and so on. Let's look at some example scenarios to understand the concept better. Scenario 1 Input: 45 -> 21 -> 2 -> 213 -> 3 -> 34 -> 78 -> 12 Output: 45 -> 2 -> 21 -> 34 -> 213 -> 78 ... Read More
We are given a string containing only digits from 0 to 9, and we need to check whether it is an additive number. An additive number is a string that can form an additive sequence, where each number (starting from the third) is the sum of the previous two. For the sequence to be valid, it must have at least three numbers. Let's look at the example scenarios to understand the problem clearly: Scenario 1 Input: "112358" Output: true Explanation: The digits can form the sequence: 1, 1, 2, 3, 5, 8 Here, 1 + 1 = 2 1 ... Read More
TreeMap is based on the Red-Black tree structure, which is a It is a part of the Java Collections Framework. It is a sorted map and maintains the order of its keys. Its order depends on the natural ordering of the keys or by a Comparator.Since the TreeMap is not a Collection, we cannot use the for-each loop to iterate through it. Instead, we can use the entrySet() method to get a set view of the mappings contained in the map, which we can then iterate over to access the keys and values. Let's explore some scenarios to understand the ... Read More
In this problem, our task is to find the area of the largest triangle that can be inscribed in a regular hexagon. Each side of the hexagon and triangle is of length a and b, respectively. Area of the Largest Triangle Inscribed in a Hexagon You can calculate the area of the largest triangle inscribed in a regular hexagon using the following formula: $$ Area\ of\ triangle\ inside\ hexagon\ = \frac{3\sqrt{3}}{4} \cdot a^2 $$ Derivation The first step is to establish a relation between a and b, as the value of a(side of the hexagon) is ... Read More
In C/C++, an error occurs due to an invalid operation performed by the user. The error normally stops the program execution until it is fixed. So, the error should be removed before compilation and execution. Types of Error in C/C++ Following is the list of errors occur in C/C++ programming: Syntax Error Run-Time Error Linker Error Logical Error Semantic Error In this article, we will see the implementation of error in C/C++ programs. Syntax Error The syntax error ... Read More
LinkedHashSet is a part of Java's Collection Framework. It is a type of Set that keeps the order of elements the same as they were added. It uses a combination of a hash table and a linked list to store elements.Our task is to traverse/iterate through the elements of a LinkedHashSet in Java. Let's look at some scenarios to understand the problem better: Scenario 1 Input: {1, 2, 3, 4, 5} Output: 1 2 3 4 5 Explanation: The LinkedHashSet contains the elements 1, 2, 3, 4, and 5. When we iterate through it, we get the elements in the ... Read More
HashSet is a class in Java that implements the Set interface. It is used for storing unique elements. Our task is to check if a HashSet contains another collection in Java. Let's look at some scenarios to understand the problem better: Scenario 1 Input: {1, 2, 3, 4, 5} Collection to check: {2, 3} Output: true Explanation: The HashSet contains all the elements of the collection {2, 3}. Scenario 2 Input: {1, 2, 3, 4, 5} Collection to check: {6, 7} Output: false Explanation: The HashSet does not contain all the elements of the collection {6, 7}. Checking ... Read More
A diagonal of a polygon is the line joining two vertices that are not adjacent to each other. The formula for calculating the area of a square with diagonal length is a2 = d2 / 2, where a and d are the side and diagonal length of the square, respectively. The visual representation of the derivation of the formula is given below: Here are some example scenarios to calculate the area of a square from the diagonal length using the above formula: Scenario 1 Input: d = 10 Output: 50 Explanation: Using the formula: area = ... Read More
The area of a triangle is given as (base * height) / 2, and the area of a parallelogram is base * height. For calculating the area of the triangle inside the parallelogram, we divide the area of the parallelogram by 2, i.e., (base * height) / 2, where the base and the height of the parallelogram are given. Here are some example scenarios to calculate the area of a triangle inside a parallelogram using the above formula: Scenario 1 Input: base = 10, height = 8 Output: 40 Explanation: Using the formula: Area ... Read More
An arithmetic mean is the average of all the given numbers, which is calculated by summing all the numbers and dividing this calculated sum by the total number of elements. The formula for calculating the arithmetic mean is: $$ \bar{x} = \frac{1}{n} \sum_{i=1}^{n} x_i = \frac{x_1 + x_2 + x_3 + \cdots + x_n}{n} $$ Here, we are given an array of integers and our task is to calculate the arithmetic mean of these numbers using the above formula: Scenario 1 Input: num = 2, 7, 4, ... Read More