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#include <iostream>
#include <fstream>
using namespace std;
int n,m,a[100][100];
void citire()
{fstream f("sortaret.in",ios::in);
f>>n>>m;int x,y,i,j;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
a[i][j]=0;
for(int i=1;i<=m;i++)
{f>>x>>y;
a[x][y]=1;}
}
void adancime(int S)
{fstream g("sortaret.out",ios::out);
int x[100],vizitat[50],k,i;
for(i=1;i<=n;i++)
vizitat[i]=0;
x[1]=S;
k=1;
while(k>0)
{S=x[k];k--;
g<<S<<" ";
vizitat[S]=2;
for(i=1;i<=n;i++)
if((vizitat[i]==0)&&(a[S][i]==1))
{k++;
x[k]=i;
vizitat[i]=1;
}
}}
int main()
{citire();
adancime(1);
}