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Cod sursa(job #466910)
#include <iostream>
#include <fstream>
#include <stdlib.h>
#define nmax 600002
using namespace std;
const char iname[] = "congr.in";
const char oname[] = "congr.out";
//const int nmax = 600002;
ifstream fin(iname);
ofstream fout(oname);
long long P, A[nmax], j, C[nmax], x, y, k, poz, oki;
void test()
{
int i;
long long suma = 0;
for(i = 1; i <= P; i ++)
suma += A[C[i]];
if(suma % P == 0)
{
oki = 1;
for(i = 1; i <= P; i ++)
fout << C[i] << " ";
exit(0);
}
return;
}
void back(int k)
{
int i;
if(k - 1 == P)
test();
else
for(i = C[k - 1] + 1; i <= 2 * P - 1 - P + k; i ++)
{
C[k] = i;
back(k + 1);
}
}
int main()
{
fin >> P;
int i;
for(i = 1; i <= 2 * P - 1; i ++)
fin >> A[i];
back(1);
return 0;
}