C++ :: Sorting Two Arrays Of Structures?

I wanted to sort two structure-arrays according to their element values and get their indices changed accordingly.For example if my array is

A[]= { 2 4 1 8 6}
indices[]={ 1 2 3 4 5}

then after sorting it should become

A[]= { 1 2 4 6 8}
indices[]={ 3 1 2 5 4}

I tried implementing it using the following code but I failed to get correct output.

Code:

#include<iostream>
#include<cstdio>
using namespace std;
#define inf 100000
struct array
{
int x;
int y;
};

[code]....