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In this core java programming tutorial we will Write a Program to Find position from which sorted array has been rotated in java.
You are given a sorted array but it has been rotated, Find position from which sorted array has been rotated in java.
But how array is rotated?
Let’s understand rotation of array by diagrams -
Our initial array is -
Rotate the array -
Array formed after rotation -
Now, we could say array is rotated from third position i.e. at 1.
Let’s take few more example arrays in java >
1, 2, 3, 4 - Array has not been rotated
2, 3, 4, 1 - Array has been rotated from 3 position
3, 4, 1, 2 - Array has been rotated from 2 position
4, 1, 2, 3 - Array has been rotated from 1 position
Example/ Full Program/SourceCode to Find position from which sorted array has been rotated in java >
/** Copyright (c), AnkitMittal JavaMadeSoEasy.com */
public class FindPositionFromWhichSortedArrayRotatedExample {
public static void main(String[] args) {
int ar[] = { 4, 1, 2, 3 };
for (int n : ar)
System.out.print(n + " ");
System.out.print(" : ");
for (int i = 0; i < ar.length; i++) {
if (i + 1 == ar.length) {
System.out.println("Array has not been rotated");
} else {
if (ar[i] > ar[i + 1]) {
System.out.println("Array has been rotated from " + (i+1)
+ " position");
break;
}
}
} //end for loop
}
}
/* output
4 1 2 3 : Array has been rotated from 1 position
*/
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So in this core java programming tutorial we wrote a Program to Find position from which sorted array has been rotated in java.
You were given a sorted array but it was rotated, we found position from which sorted array was rotated in java.
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