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Cod sursa(job #981575)
#include <fstream>
#include <vector>
#include <set>
#define NM 30010
using namespace std;
ifstream f("count.in");
ofstream g("count.out");
int N, M;
bool In[NM];
set<int> G[NM];
int DG[NM], Count[10];
vector<int> V;
set< pair<int, int> > Nodes;
set< pair<int, int> >::iterator it;
void Solve ()
{
if (V.size()<=2) return;
int a, b, c, d;
if (V.size()==3)
{
a=V[0];
b=V[1];
c=V[2];
if (G[a].find(b)==G[a].end() || G[a].find(c)==G[a].end() || G[b].find(c)==G[b].end()) return;
Count[3]++;
}
else
{
a=V[0];
b=V[1];
c=V[2];
d=V[3];
if (G[a].find(b)!=G[a].end() && G[a].find(c)!=G[a].end() && G[b].find(c)!=G[b].end()) Count[3]++;
if (G[a].find(b)!=G[a].end() && G[a].find(d)!=G[a].end() && G[b].find(d)!=G[b].end()) Count[3]++;
if (G[a].find(c)!=G[a].end() && G[a].find(d)!=G[a].end() && G[c].find(d)!=G[c].end()) Count[3]++;
if (G[a].find(b)!=G[a].end() && G[a].find(c)!=G[a].end() && G[a].find(d)!=G[a].end() && G[b].find(c)!=G[b].end() && G[b].find(d)!=G[b].end() && G[c].find(d)!=G[c].end()) Count[4]++;
}
}
int main ()
{
f >> N >> M;
for (int i=1; i<=M; i++)
{
int a, b;
f >> a >> b;
G[a].insert(b);
G[b].insert(a);
DG[a]++;
DG[b]++;
}
Count[1]=N;
Count[2]=M;
for (int i=1; i<=N; i++)
{
In[i]=1;
Nodes.insert(make_pair(DG[i], i));
}
while (!Nodes.empty())
{
it=Nodes.begin();
int node=it->second;
Nodes.erase(it);
V.clear();
V.push_back(node);
In[node]=0;
for (set<int>::iterator v=G[node].begin(); v!=G[node].end(); ++v)
if (In[*v])
V.push_back(*v);
Solve();
for (vector<int>::iterator x=V.begin(); x!=V.end(); ++x)
if (*x!=node)
{
Nodes.erase(make_pair(DG[*x], *x));
DG[*x]--;
Nodes.insert(make_pair(DG[*x], *x));
}
}
for (int i=4; i>=1; i--)
if (Count[i]!=0)
{
g << i << ' ' << Count[i] << '\n';
break;
}
f.close();
g.close();
return 0;
}