Question

How to find all triplets with zero sum in a given array with PHP

Answer 1

function findTripletsWith0Sum($arr) {
    $found = false;
    $size = count($arr);
    
    for ($i = 0; $i < $size - 2; $i++) {
        for ($j = $i + 1; $j < $size - 1; $j++) {
            for ($k = $j + 1; $k < $size; $k++) {
                if ($arr[$i] + $arr[$j] + $arr[$k] == 0) {
                    echo $arr[$i] . " + " . $arr[$j] . " + " . $arr[$k] . "\n";
                    $found = true;
                }
            }
        }
    }
    
    if ($found == false) {
        echo "Not found";
    }
}
        
$arr = array(1, 0, 3, 2, -1, -2, -3, 4);
        
findTripletsWith0Sum($arr);





/*
run:
 
1 + 0 + -1
1 + 2 + -3
0 + 3 + -3
0 + 2 + -2
3 + -1 + -2
-1 + -3 + 4
 
*/

 

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