# Data Structures Practice Test

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#### Which of the following uses the first-in, first-out (FIFO) method?

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Explanation:
A queue is a linear structure in which operations are carried out in a specific order. First in, first out is the order (FIFO).

#### Which of the following isn't an example of an internal sort?

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Explanation:
Merge sort (also known as mergesort) is a general-purpose, comparison-based sorting algorithm developed in computer science.

#### The first element of an array's memory address is referred to as.

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Explanation:
The array's initial address - the address of the array's first member – is known as the array's base address.

#### Because aposterior analysis is more accurate than apriori analysis, it is

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Explanation:
Actual statistics like as running time and required space are gathered in this analysis

#### Check that all of the statements are correct.

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Explanation:
Swift has Optional, whereas Java 7 does not.
Swift has Type Inferencing, while Java does not.
Swift has Structs, whereas Java 7 does not.

#### Prefix notation is also referred to as

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Explanation:
Polish notation (PN), also known as normal Polish notation (NPN), ukasiewicz notation, Warsaw notation, Polish prefix notation, or simply prefix notation, is a mathematical notation in which operators come before their operands, as opposed to infix notation, in which operators come between operands, and reverse Polish notation (RPN), in which operators come after their operands.

#### The level is the point at where the model becomes executable code.

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Explanation:
Implementation level: A specific representation of the data structure and the coding of the operations in a computer language. Application (user)-to-Implementation-Level Communication

#### In ___, the herder node serves as a sentinel.

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Explanation:
A binary tree is a tree data structure in which each node has at most two offspring, referred to as the left child and the right child in computer science. A (non-empty) binary tree is a tuple (L, S, R), where L and R are binary trees or the empty set, and S is a singleton set containing the root, according to a recursive definition using just set theory principles. The binary tree can also be the empty set, according to certain writers.

#### The number of binary trees with three nodes that deliver the result when traversed in post order. What is the A,B,C sequence?

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Explanation:
There are five binary trees (each with three nodes) that can be created

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Explanation:

#### The traversal of a binary search tree in order will give

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Explanation:
The operation or technique of ordering and rearranging groups of data in a specified order is referred to as sorting. A list is a collection of records, each of which has one or more fields. The key field refers to the fields that carry a unique value for each record.

#### Before moving on to the next vertex, the _________ traversal processes all of a vertex's descendants.

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Explanation:
The depth-first search (DFS) algorithm is used to traverse or explore data structures such as trees and graphs. The algorithm starts at the root node (in the case of a graph, any random node can be used as the root node) and examines each branch as far as feasible before retracing.

#### Stack can also be referred to ;

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Explanation:
Because the first inserted member can only be removed last and the last inserted element will be removed first, the stack is also known as a Last In First Out (LIFO) data structure. A stack is a linear list with all additions and deletions limited to only one end. As a result, it's also known as a restrictive data structure.

#### Which of these alogrithmic methods attempts to find a localized optimum solution -

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Explanation:
Greedy Algorithm. All data structures are combined, and the concept is used to form a specific algorithm. All algorithms are designed with a motive to achieve the best solution for any particular problem. In the greedy algorithm technique, choices are being made from the given result domain. As being greedy, the next to a possible solution that looks to supply the optimum solution is chosen.

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Explanation:

#### A procedure that calls itself is referred to as a

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Explanation:
A recursive data structure is one that can be broken down into smaller or simpler versions of itself. Trees, for example, are made up of small trees and leaf nodes, whereas lists might have smaller lists as elements.

#### Two-dimensional arrays are also referred to as

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Explanation:
Two-dimensional arrays, often known as tables or matrix, have two subscripts.

#### Which method can determine whether two vertices x and y have a path connecting them?

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Explanation:
A path between two vertices of a linked graph can be determined using both BFS and DFS.

#### The best way to code programs and generate functions is to use recursion.

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Explanation:
When a thing is defined in terms of itself or its type, recursion (adjective: recursive) happens. Recursion is used in a wide range of fields, from linguistics to logic. Recursion is most commonly used in mathematics and computer science, when a function is defined and then applied within its own definition.

#### In order for a binary search method to work, the array (list) must be empty

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Explanation:
Binary Search Algorithm Binary Search is used to search a huge sorted array or list. Its O (log n) time complexity makes it very quick when compared to other sorting algorithms. The array or list of elements must be sorted in order for the binary search method to work.

#### Non-homogeneous data items cannot be stored in which of the following data structures?

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Explanation:
An array data structure, or simply an array, is a data structure in computer science that consists of a collection of elements (values or variables), each of which is identified by at least one array index or key. An array is stored in such a way that the position of each member may be calculated using a mathematical formula from its index tuple. A linear array, often known as a one-dimensional array, is the most basic data structure.

#### Scheduling a project is an example of

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Explanation:
Dynamic programming is a computer programming method as well as a mathematical optimization tool. Richard Bellman created the approach in the 1950s, and it has since been used in a variety of sectors ranging from aeronautical engineering to economics.

#### The data structure of a queue is based on

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Explanation:
The queue is a data structure that is both non-primitive and linear. It is based on the FIFO concept (First In First Out). That is, the element that is inserted first is removed first, followed by the element that is added last and removed last.

#### When determining the efficiency of an algorithm, the time factor is

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Explanation:
The time factor is assessed by measuring the number of essential operations to determine an algorithm's efficiency. It is not measured by the number of statements because a lower number of statements does not imply a more efficient program. For improved efficiency, we frequently have to develop huge code. Space complexity is measured in kilobytes.

#### What data structure may be utilized to determine whether or not a syntax contains balanced paranthesis?

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Explanation:
The stack data structure comes in helpful here to check for balanced parentheses in the syntax.