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.
Python3
# Python3 program to Split the array # and add the first part to the end # Function to reverse arr[] # from index start to end*/ def rvereseArray(arr, start, end):
while start < end :
temp = arr[start]
arr[start] = arr[end]
arr[end] = temp
start + = 1
end - = 1
# Function to print an array def printArray(arr, n) :
for i in range (n):
print (arr[i], end = " " )
# Function to left rotate # arr[] of size n by k */ def splitArr(arr, k, n):
rvereseArray(arr, 0 , n - 1 )
rvereseArray(arr, 0 , n - k - 1 )
rvereseArray(arr, n - k, n - 1 )
# Driver Code arr = [ 12 , 10 , 5 , 6 , 52 , 36 ]
n = len (arr)
k = 2
splitArr(arr, k, n) printArray(arr, n) # This code is contributed # by Shrikant13 |
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!