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Cod sursa(job #655738)
#include <fstream>
#include <cstdlib>
#include <ctime>
using namespace std;
ifstream f("congr.in");
ofstream g("congr.out");
int p,i,j;
int a[600000],b[600000];
long long s=0;
int main () {
srand(time(0));
f >> p;
for (i=1;i<2*p;i++) {
f >> a[i];
b[i]=i;
if (i<=p) s+=a[i];
}
while (s%p) {
i=1+rand()%p;
j=1+p+rand()%(p-1);
s=s+a[b[j]]-a[b[i]];
swap(b[i],b[j]);
}
for (i=1;i<=p;i++)
g << b[i] << ' ';
g << '\n';
f.close();g.close();
return 0;
}