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Cod sursa(job #658813)
#include <fstream>
#include <algorithm>
#define l 1000000
using namespace std;
ifstream f("congr.in");
ofstream g("congr.out");
long long p,i,v[l],r[l],s,j;
int main()
{
f>>p;
for(i=1; i<=2*p-1; i++) f>>v[i];
for(i=1; i<=p; i++) r[i]=1;
for(;;)
{
random_shuffle(r+1,r+2*p);
for(j=1; j<=2*p-1; j++)
if (r[j]==1) s+=v[j];
if (s%p==0)
{
for(j=1; s&&j<=2*p-1; j++)
if (r[j]==1) g<<j<<" ";
break;
}
s=0;
}
g<<'\n';
f.close();
g.close();
return 0;
}