Write a PHP program to sort a list of elements using Merge sort
- برمجة بي اتش بي
- 2021-09-10
- mhanasmh00489829403
Write a PHP program to sort a list of elements using Merge sort.
According to Wikipedia "Merge sort (also commonly spelled mergesort) is an O (n log n) comparison-based sorting algorithm. Most implementations produce a stable sort, which means that the implementation preserves the input order of equal elements in the sorted output."
الأجوبة
<?php
function merge_sort($my_array){
if(count($my_array) == 1 ) return $my_array;
$mid = count($my_array) / 2;
$left = array_slice($my_array, 0, $mid);
$right = array_slice($my_array, $mid);
$left = merge_sort($left);
$right = merge_sort($right);
return merge($left, $right);
}
function merge($left, $right){
$res = array();
while (count($left) > 0 && count($right) > 0){
if($left[0] > $right[0]){
$res[] = $right[0];
$right = array_slice($right , 1);
}else{
$res[] = $left[0];
$left = array_slice($left, 1);
}
}
while (count($left) > 0){
$res[] = $left[0];
$left = array_slice($left, 1);
}
while (count($right) > 0){
$res[] = $right[0];
$right = array_slice($right, 1);
}
return $res;
}
$test_array = array(100, 54, 7, 2, 5, 4, 1);
echo "Original Array : ";
echo implode(', ',$test_array );
echo "\nSorted Array :";
echo implode(', ',merge_sort($test_array))."\n";
?>Sample Output:
Original Array : 100, 54, 7, 2, 5, 4, 1 Sorted Array : 1, 2, 4, 5, 7, 54, 100
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