### Left Rotation in an Array using Java

Left Rotation in an Array using Java

There are two methods implemented by me here :-

1) Using extra Array
1.  Get new position of  a current element using formula.
2.  Add the element in the new position in a new array.

2) Using same Array:- This is little bit complex

1. hold variable at index i.
2. find new index for variable.
3. hold variable present at new index.
4. place variable at index i to this new index.
5. assign i to new index variable.
6. repeat steps until count is not equal to lenght of an array which simply means all variable got covered.

```package Arrays;

/*
* 12345 to 34512
*/

/*
* sample input
* 5 4(d=4 that is 4 rotations)
1 2 3 4 5
sample output
51234
*/
public class LeftRotation {

public static void printArray(int[] arr)
{

for(int i=0;i<arr.length;i++)
{
System.out.print(" "+arr[i]);
}
System.out.println(" ");
}

//method which returns rotated array using extra array
public static int[] leftRotate(int[] arr, int rotation)
{
int temparr[]=new int[arr.length];
int pos;
for(int i=0;i<arr.length;i++)
{
pos=(arr.length+(i-rotation))%arr.length;
temparr[pos]=arr[i];
}
printArray(temparr);

return temparr;
}

//method which returns rotated array using same array
public static int[] leftRotate2(int[] arr, int rotation)
{

int pos,tempinit,temppos=arr,i=0,c=0;

while(c!=arr.length){
tempinit=temppos;
pos=(arr.length+(i-rotation))%arr.length;
temppos=arr[pos];
arr[pos]=tempinit;
i=pos;
c++;
}

printArray(arr);

return arr;
}

public static void main(String[] args)
{
int[] arr={1,2,3,4,5};
leftRotate(arr, 3);
leftRotate2(arr, 3);
}
}
```

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