Given an array and split it from a specified position, and move the first part of array add to the end.
Examples:
Input : arr[] = {12, 10, 5, 6, 52, 36}
k = 2
Output : arr[] = {5, 6, 52, 36, 12, 10}
Explanation : Split from index 2 and first
part {12, 10} add to the end .
Input : arr[] = {3, 1, 2}
k = 1
Output : arr[] = {1, 2, 3}
Explanation : Split from index 1 and first
part add to the end.
A O(n*k) solution is discussed here.
This problem can be solved in O(n) time using the reversal algorithm discussed below,
1. Reverse array from 0 to n – 1 (where n is size of the array).
2. Reverse array from 0 to n – k – 1.
3. Reverse array from n – k to n – 1.
PHP
<?php // PHP program to Split the array and // add the first part to the end /* Function to reverse arr[] from index start to end*/function rvereseArray(&$arr, $start, $end) { while ($start < $end) { $temp = $arr[$start]; $arr[$start] = $arr[$end]; $arr[$end] = $temp; $start++; $end--; } } // Function to print an array function printArray(&$arr, $size) { for ($i = 0; $i < $size; $i++) echo $arr[$i] . " "; } /* Function to left rotate arr[] of size n by k */function splitArr(&$arr, $k, $n) { rvereseArray($arr, 0, $n - 1); rvereseArray($arr, 0, $n - $k - 1); rvereseArray($arr, $n - $k, $n - 1); } /* Driver program to test above functions */$arr = array( 12, 10, 5, 6, 52, 36 ); $n = sizeof($arr); $k = 2; // Function calling splitArr($arr, $k, $n); printArray($arr, $n); // This code is contributed // by Akanksha Rai(Abby_akku) ?> |
Output:
5 6 52 36 12 10
Please refer complete article on Split the array and add the first part to the end | Set 2 for more details!
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