#include <bits/stdc++.h>
using namespace std;
const int MAX_VERT = 102;
class GraphLink
{
public:
bool connected;
int value;
GraphLink()
{
connected = false;
value = 0;
}
};
class Graph
{
public:
int vertices;
GraphLink links[MAX_VERT][MAX_VERT];
};
void readGraph(Graph& g, char* filename)
{
fstream fin(filename);
fin>>g.vertices;
int nlinks;
fin>>nlinks;
for(int i=0;i<nlinks;i++)
{
int vfrom, vto;
fin>>vfrom>>vto;
g.links[vfrom][vto].connected = true;
g.links[vto][vfrom].connected = true;
}
}
void writeGraph(Graph& g, char* filename)
{
fstream fout(filename);
int nlinks;
for(int i=0;i<nlinks;i++)
for(int j=0;j<nlinks;j++)
{
if(g.links[i][j].connected == true && g.links[j][i].connected == true)
fout<<i<<" "<<j;
}
}
Graph grdata;
int main()
{
readGraph(grdata, "gr.inp");
writeGraph(grdata, "gr.out");
return 0;
}
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