# Algorithm analysis| Introduction To Analysis of Algorithms

An algorithm is a set of instructions that a computer employs to solve a specific problem in computer programming. When we need to address a problem, we utilize computers to process a large amount of data. There has to be a way to comprehend this information and how we’re supposed to digest it. Essentially, this is where algorithms come into play.

In computational complexity theory, algorithm analysis is crucial for determining how resources are required to solve algorithms. Here is an introduction to algorithm analysis.

**What is Algorithm Analysis?**

Algorithm analysis is crucial in determining how many resources an algorithm will require to solve a specific problem in computational complexity theory. Moreover, analyzing algorithms helps determine how much time and space you need to execute them.

**Asymptotic Analysis of Algorithm **

The technique of estimating an algorithm’s running time in terms of mathematical units to explore its limitations, or “run-time performance,” is known as asymptotic analysis.

Furthermore, in this study, the best, worst, and average case processing times are determined. Although asymptotic analysis is not a method of deep learning training, it is an essential diagnostic tool for assessing an algorithm’s efficiency rather than its correctness.

**Algorithm Complexity Analysis**

Without defining the term “algorithm complexity,” we cannot discuss algorithms and data structures. Rather than going into mathematical definitions, we will simply explain what the term means. Depending on the input data size, algorithm complexity measures the order of operations performed by an algorithm.

In other words, complexity is an approximate measure of how many steps an algorithm requires. The complexity of a program is calculated by counting how many operations occurred in order, not by counting the operations themselves. If we have an order of N2 operations for N elements, N2/2 and 3*N2 will have the same quadratic order. Additionally, algorithm complexity is commonly expressed using the O(f) notation, which has also been called asymptotic notation, or “Big O” notation, depending on the input data size.

**The Efficiency of An Algorithm**

It is critical to make efficient use of computer resources. The amount of computational power consumed by an algorithm is used to determine its efficiency. To learn how much help an algorithm consumes, it is required to analyze it. The efficiency of an algorithm can be determined based on the resources used.

The goal is to employ as few resources as possible to maximize algorithm efficiency. Because time and space complexity cannot be directly compared, they should be addressed for algorithmic efficiency.

**Why is Algorithm Analysis Important?**

The analysis of algorithms is an essential part of computational complexity theory. The following points highlight the importance of algorithm analysis:

- Algorithm analysis allows one to predict the behavior of an algorithm without having to implement it on a specific computer.

- Rather than developing and testing the algorithm every time the underlying computer system is changed, the efficiency of an algorithm may be easily measured with simple measures.

- There is no way to predict an algorithm’s behavior accurately. It’s difficult to predict which factors will impact the decision-making process.

- As a result, rather than being a perfect science, the analysis is an estimate.

- Furthermore, by comparing multiple algorithms, we can find the one that best suits our needs.

**How to Find Complexity Of Algorithm**

The big oh of an algorithm refers to the algorithm’s complexity, which explains how many operations are affected when input grows. Typically, you can determine an algorithm’s complexity by the statements it employs. For some statements, the following are constant times.

1. The running time for these operations (arithmetic, comparing values, examining array elements, assignment) is constant O(1).

As an example:

read(x) // O(1)

a = 10; // O(1)

a = 1.000.000.000.000.000.000 // O(1)

2. Using only the maximum running time from two or more possible statements.

As an example:

age = read(x) // (1+1) = 2

if age < 17 then begin // 1

status = “Not allowed!”; // 1

end else begin

status = “Welcome! Please come in”; // 1

visitors = visitors + 1; // 1+1 = 2

end;

So, with the above pseudocode, T(n) = 2 + 1 + max(1, 1 + 2) = 6 is the complexity. This means that our big oh’s still constant at T(n) = O(1).

3. The Nested Loop (looping within looping) uses O(n2) or O(n3) computation time, as at least one loop is inside the main loop.

As an example:

for i = 1 to n do begin // (1+1)*n = 2n

for j = 1 to n do begin // (1+1)n*n = 2n^2

x = x + 1; // (1+1)n*n = 2n^2

print(x); // (n*n) = n^2

end;

end;

**Final Note**

Earlier, we had discussed related topics in algorithm analysis. We believe your confusion about algorithm analysis is now clear. If you have further questions in mind, feel free to let us know.