PHP Challenges: Find three numbers from an array such that the sum of three consecutive numbers equal to a given number

PHP Challenges - 1: Exercise-7 with Solution

Write a PHP program to find three numbers from an array such that the sum of three consecutive numbers equal to a given number.

Input : (array(2, 7, 7, 1, 8, 2, 7, 8, 7), 16))

Sample Solution :

PHP Code :

<?php
// Function to find triplets in an array whose sum equals a given target
function three_Sum($arr, $target)
{
    // Calculate the number of elements in the array minus 2
    $count = count($arr) - 2;
    // Initialize an empty array to store the result
    $result=[];
    // Iterate through the array
    for ($x = 0; $x < $count; $x++) {
        // Check if the sum of the current element and the next two elements equals the target
        if ($arr[$x] + $arr[$x+1] + $arr[$x+2] == $target) {
            // If true, push the triplet to the result array
            array_push($result, "{$arr[$x]} + {$arr[$x+1]} + {$arr[$x+2]} = $target");
        }
    }
    // Return the array of triplets whose sum equals the target
    return $result;
}

// Define an array of numbers
$my_array = array(2, 7, 7, 1, 8, 2, 7, 8, 7);

// Test the three_Sum function with the defined array and different target values, and print the result
print_r(three_Sum($my_array, 16));
print_r(three_Sum($my_array, 11));
print_r(three_Sum($my_array, 12));
?>

Explanation:

Here is a brief explanation of the above PHP code:

• Function definition:
• The code defines a function named "three_Sum()" which takes two parameters: an array '$arr' and a target number '$target'.
• Inside the function:
• It calculates the number of elements in the array minus 2 and stores it in '$count'.
• It initializes an empty array '$result' to store the triplets whose sum equals the target.
• It iterates through the array using a "for" loop.
• For each iteration, it checks if the sum of the current element and the next two elements equals the target.
• If the condition is true, it formats the triplet as a string and pushes it into the '$result' array.
• Finally, it returns the '$result' array containing all the triplets whose sum equals the target.
• Function Call & Testing:
• An array '$my_array' is defined with a set of numbers.
• The "three_Sum()" function is called three times with this array as input and different target sums (16, 11, 12).
• The results of the function calls are printed using "print_r()", which displays the array of triplets whose sum equals the target for each input target sum.

Sample Output:

Array                                                       
(                                                           
    [0] => 2 + 7 + 7 = 16                                   
    [1] => 7 + 1 + 8 = 16                                   
)                                                           
Array                                                       
(                                                           
    [0] => 1 + 8 + 2 = 11                                   
)                                                           
Array                                                       
(                                                           
)             

Flowchart:

PHP Code Editor:

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