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Cod sursa(job #999304)
#include <fstream>
#include <vector>
#include <bitset>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
vector < int > G[50005];
int n, m, sol[50005], dim, x, y;
bitset < 50005 > viz(0);
void dfs(int nod)
{
viz[nod]=1;
for (int i=0; i<G[nod].size(); ++i)
if (!viz[G[nod][i]]) dfs(G[nod][i]);
sol[++dim]=nod;
}
int main()
{
f>>n>>m;
for (int i=1; i<=m; ++i)
{
f>>x>>y;
G[x].push_back(y);
}
for (int ii=1; ii<=n; ++ii)
if (!viz[ii]) dfs(ii);
for (int i=dim; i>0; --i)
g<<sol[i]<<' ';
return 0;
}