Algorithms
Topics:
Linear Search

Linear Search

Linear search is used on a collections of items. It relies on the technique of traversing a list from start to end by exploring properties of all the elements that are found on the way.

For example, consider an array of integers of size $$N$$. You should find and print the position of all the elements with value $$x$$. Here, the linear search is based on the idea of matching each element from the beginning of the list to the end of the list with the integer $$x$$, and then printing the position of the element if the condition is `True'.

Implementation:

The pseudo code for this example is as follows :

for(start to end of array)
{
    if (current_element equals to 5)  
    {
        print (current_index);
    }
}

For example, consider the following image:

enter image description here

If you want to determine the positions of the occurrence of the number $$7$$ in this array. To determine the positions, every element in the array from start to end, i.e., from index $$1$$ to index $$10$$ will be compared with number $$7$$, to check which element matches the number $$7$$.

Time Complexity:

The time complexity of the linear search is $$O(N)$$ because each element in an array is compared only once.

Contributed by: Anand Jaisingh
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