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<?php function countTriplets($k,$array) { $result = 0; $compare = $array; foreach($compare as $K => $V){ $triplet = array(); $sum = $V; array_push($triplet,$V); foreach($array as $key => $val){ if(intval($key) > intval($K)){ if(($val < ($k - $sum)) && (count($triplet) == 1)){ array_push($triplet,$val); $sum += $val; continue; } if((count($triplet) == 2)&&($val == ($k - $sum))){ array_push($triplet,$val); $sum += $val; continue; } } } if(($k == $sum) && (count($triplet) == 3)) { echo json_encode($triplet); echo "<br>"; $result++; } } return $result; } echo "<br>--------16---------<br>"; echo countTriplets(16, [12, 3, 4, 1, 6, 9]); echo "<br>--------24---------<br>"; echo countTriplets(24,[12, 3, 4, 1, 6, 9]); echo "<br>--------32---------<br>"; echo countTriplets(32, [12, 3, 4, 1, 6, 9]); ?> <div class="panel-body"> <h1>Count of all triplets with constant sum</h1> <p>Given an array of numbers, write an algorithm to find all the triplets of the numbers whose sum is a constant <strong>K</strong></p> <p>Implement the placeholder function (in the code editor) which takes an input integer array and returns the count of triplets</p> <h2>Below are a few examples:</h2> <p><strong>Example 2:</strong> For the array <strong>[12, 3, 4, 1, 6, 9]</strong> and K = <strong>16</strong>, there are three triplet [ 12, 3, 1 ], [3, 4, 9] and [1, 6, 9] that sums to 16. And, it returns the count as <strong>2</strong></p> <p><strong>Example 2:</strong> For the array <strong>[12, 3, 4, 1, 6, 9]</strong> and K = <strong>24</strong>, there is only one triplet [ 12, 3, 9 ] that sums to 24. And, it returns the count as <strong>1</strong></p> <h2>Note</h2> <ul> <li>Implement the placeholder function</li> <li>First input is an integer constant</li> <li>Second input is an integer array</li> <li>If you choose C or C++, you have the third integer input which is the length of input array</li> <li>And the function returns an integer (count)</li> <li>Total number of elements in the input array can range from 5 to 10000</li> <li>Value of input array elements can range from 0 to 50000</li> <li>Output count is <span class="caps">NOT</span> a distinct triplets count. There can be duplicate triplets.</li> </ul> </div>