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Cod sursa(job #644238)
# include <cstdio>
# include <set>
# include <vector>
using namespace std;
using namespace __gnu_cxx ;
const char *FIN = "count.in", *FOU = "count.out";
const int MAX = 30105;
int N, M, sol[2];
set <int> G[MAX];
vector <int> E;
int main (void) {
freopen (FIN, "r", stdin);
scanf ("%d %d", &N, &M);
for (int i = 1, x, y; i <= M; ++i) {
scanf ("%d %d", &x, &y);
G[x].insert (y);
G[y].insert (x);
}
for (int i = 1; i <= N; ++i)
if (G[i].size () < 6)
E.push_back (i);
for (vector <int> :: iterator it = E.begin (); it != E.end (); ++it) {
for (set <int> :: iterator i = G[*it].begin (); i != G[*it].end (); ++i)
for (set <int> :: iterator j = i; j != G[*it].end (); ++j)
if (*j > *i && G[*j].count (*i) > 0) {
++sol[0];
for (set <int> :: iterator k = j; k != G[*it].end (); ++k)
if (*k > *j && G[*k].count (*i) > 0 && G[*k].count (*j) > 0)
++sol[1];
}
for (set <int> :: iterator i = G[*it].begin (); i != G[*it].end (); ++i) {
G[*i].erase (*it);
if (G[*i].size () == 5)
E.push_back (*i);
}
}
if (sol[1]) fprintf (fopen (FOU, "w"), "4 %d", sol[1]);
else if (sol[0]) fprintf (fopen (FOU, "w"), "3 %d", sol[0]);
else fprintf (fopen (FOU, "w"), "2 %d", M);
}