#include<bits/stdc++.h>
using namespace std;
int main()
{
int n, i, j;
while(cin >> n)
{
int a[n];
for(i=0; i<n; i++)
cin >> a[i];
int p;
cin >> p;
int r = p, b = 0, c = 0;
sort(a, a+n);
for(i=0; i<n-1; i++)
{
for(j=i; j<n; j++)
{
if(a[i] + a[j] == p)
{
if(r > (a[i] - a[j]))
{
b = a[i];
c = a[j];
if(a[i] > a[j])
r = a[i] - a[j];
else
r = a[j] - a[i];
}
}
}
}
if(c > b)
swap(b, c);
cout << "Peter should buy books whose prices are " << c << " and " << b << "." << endl << endl;
}
return 0;
}
using namespace std;
int main()
{
int n, i, j;
while(cin >> n)
{
int a[n];
for(i=0; i<n; i++)
cin >> a[i];
int p;
cin >> p;
int r = p, b = 0, c = 0;
sort(a, a+n);
for(i=0; i<n-1; i++)
{
for(j=i; j<n; j++)
{
if(a[i] + a[j] == p)
{
if(r > (a[i] - a[j]))
{
b = a[i];
c = a[j];
if(a[i] > a[j])
r = a[i] - a[j];
else
r = a[j] - a[i];
}
}
}
}
if(c > b)
swap(b, c);
cout << "Peter should buy books whose prices are " << c << " and " << b << "." << endl << endl;
}
return 0;
}
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