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Cod sursa(job #999215)
#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdlib>
#include <vector>
#define nmax 600005
using namespace std;
int v[nmax], used[nmax], unused[nmax];
int p, x, y, aux, s = 0;
int main() {
srand((unsigned)time(0));
ifstream f("congr.in");
ofstream g("congr.out");
f>>p;
for(int i=1; i<2*p; i++) {
f>>v[i];
v[i] %= p;
}
used[0] = 0;
unused[0] = 0;
for(int i=1; i<=p; i++) {
used[++used[0]] = i;
s += v[i];
}
for(int i=p+1; i<2*p; i++)
unused[++unused[0]] = i;
while(1) {
if(s == 0) break;
if(s >= p && s % p == 0) break;
x = rand() % used[0] + 1;
y = rand() % unused[0] + 1;
s = s - v[used[x]] + v[unused[y]];
aux = used[x];
used[x] = unused[y];
unused[y] = aux;
}
for(int i=1; i<=used[0]; i++)
g<<used[i]<<" ";
g<<"\n";
return 0;
}