What does swap with positions means here?

I simply swapped the array elements in increasing order but one test case is showing run time error. how can i optimize my code?

Share your code via ide.codingblocks.com so that i can have a look.
But before that, please make sure you aren’t accessing any element that is out of bounds and everything related to that,
You should be able to remove seg.faults and runtime errors yourself…

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