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Php Program to Print uncommon elements from two sorted arrays

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  • Last Updated : 13 Jun, 2022
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Given two sorted arrays of distinct elements, we need to print those elements from both arrays that are not common. The output should be printed in sorted order. 
Examples : 
 

Input : arr1[] = {10, 20, 30}
        arr2[] = {20, 25, 30, 40, 50}
Output : 10 25 40 50
We do not print 20 and 30 as these
elements are present in both arrays.

Input : arr1[] = {10, 20, 30}
        arr2[] = {40, 50}
Output : 10 20 30 40 50
        

 

The idea is based on merge process of merge sort. We traverse both arrays and skip common elements.
 

PHP




<?php
// PHP program to find uncommon
// elements of two sorted arrays
 
function printUncommon($arr1, $arr2,
                       $n1, $n2)
{
    $i = 0;
    $j = 0;
    $k = 0;
    while ($i < $n1 && $j < $n2)
    {
 
        // If not common, print smaller
        if ($arr1[$i] < $arr2[$j])
        {
            echo $arr1[$i] . " ";
            $i++;
            $k++;
        }
        else if ($arr2[$j] < $arr1[$i])
        {
            echo $arr2[$j] . " ";
            $k++;
            $j++;
        }
 
        // Skip common element
        else
        {
            $i++;
            $j++;
        }
    }
 
    // printing remaining elements
    while ($i < $n1)
    {
        echo $arr1[$i] . " ";
        $i++;
        $k++;
    }
    while ($j < $n2)
    {
        echo $arr2[$j] . " ";
        $j++;
        $k++;
    }
}
 
// Driver code
$arr1 = array(10, 20, 30);
$arr2 = array(20, 25, 30, 40, 50);
 
$n1 = sizeof($arr1) ;
$n2 = sizeof($arr2) ;
 
printUncommon($arr1, $arr2, $n1, $n2);
 
// This code is contributed by Anuj_67
?>


Output : 

10 25 40 50

 

Time Complexity: O(n1 + n2), where n1 and n2 represents the size of the given two arrays.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

Please refer complete article on Print uncommon elements from two sorted arrays for more details!
 


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