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- Almost Sorted

# Almost Sorted

# Almost Sorted

Given an array of integers, determine whether the array can be sorted in ascending order using only one of the following operations one time.

- Swap two elements.
- Reverse one sub-segment.

Determine whether one, both or neither of the operations will complete the task. Output is as follows.

If the array is already sorted, output

*yes*on the first line. You do not need to output anything else.If you can sort this array using one single operation (from the two permitted operations) then output

*yes*on the first line and then:- If elements can only be swapped, and , output
*swap l r*in the second line. and are the indices of the elements to be swapped, assuming that the array is indexed from to . - If elements can only be reversed, for the segment , output
*reverse l r*in the second line. and are the indices of the first and last elements of the subarray to be reversed, assuming that the array is indexed from to . Here represents the subarray that begins at index and ends at index , both inclusive.

- If elements can only be swapped, and , output

If an array can be sorted both ways, by using either swap or reverse, choose swap.

- If the array cannot be sorted either way, output
*no*on the first line.

**Example**

Either swap the and at indices 3 and 4, or reverse them to sort the array. As mentioned above, swap is preferred over reverse. Choose swap. On the first line, print `yes`

. On the second line, print `swap 3 4`

.

**Function Description**

Complete the *almostSorted* function in the editor below.

almostSorted has the following parameter(s):

*int arr[n]*: an array of integers

**Prints**

- Print the results as described and return nothing.

**Input Format**

The first line contains a single integer , the size of .

The next line contains space-separated integers where .

**Constraints**

All are distinct.

**Output Format**

If the array is already sorted, output

*yes*on the first line. You do not need to output anything else.If you can sort this array using one single operation (from the two permitted operations) then output

*yes*on the first line and then:**a.**If elements can be swapped, and , output*swap l r*in the second line. and are the indices of the elements to be swapped, assuming that the array is indexed from to .**b.**Otherwise, when reversing the segment , output*reverse l r*in the second line. and are the indices of the first and last elements of the subsequence to be reversed, assuming that the array is indexed from to .represents the sub-sequence of the array, beginning at index and ending at index , both inclusive.

If an array can be sorted by either swapping or reversing, choose swap.

- If you cannot sort the array either way, output
*no*on the first line.

**Sample Input 1**

STDIN Function ----- -------- 2 arr[] size n = 2 4 2 arr = [4, 2]

**Sample Output 1**

```
yes
swap 1 2
```

**Explanation 1**

You can either *swap(1, 2)* or *reverse(1, 2)*. You prefer swap.

**Sample Input 2**

```
3
3 1 2
```

**Sample Output 2**

```
no
```

**Explanation 2**

It is impossible to sort by one single operation.

**Sample Input 3**

```
6
1 5 4 3 2 6
```

**Sample Output 3**

```
yes
reverse 2 5
```

**Explanation 3**

You can reverse the sub-array *d[2...5] = "5 4 3 2"*, then the array becomes sorted.