#include <bits/stdc++.h>
#define pb push_back
#define f first
#define s second
using namespace std;
typedef long long ll;
typedef long double ld;
const ll oo = 1e18 + 7;
const int N = 5e5 + 10;
const int M = 3000;
const int M1 = 1e6;
int n;
map <int, bool> mrk[N];
vector <int> a[N];
vector <int> ans;
vector <vector <int> > ans1;
vector <pair<int, int> > vc;
bool g = 1;
bool check(int x)
{
for (int i = 0; i < n; i++)
if (x == (1 << i)) return 1;
return 0;
}
void Rec(int x, int y, int prv)
{
ans1.back()[y] = x;
for (auto i : a[y])
if (i != prv)
{
int j;
for (j = 0; j < (1 << n); (j == 0 ? j++ : j <<= 1))
if (!mrk[min(x, j ^ x)][max(j ^ x, x)] && (j ^ x) != x)
{
mrk[min(x, j ^ x)][max(j ^ x, x)] = 1;
vc.pb({min(x, j ^ x), max(j ^ x, x)});
Rec(j ^ x, i, y);
break;
}
g &= (j != (1 << n));
}
}
int main()
{
ios_base::sync_with_stdio(0);
iostream::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
srand(time(NULL));
cin >> n;
for (int i = 0; i < n; i++)
{
int x, y;
cin >> x >> y;
a[x].pb(y);
a[y].pb(x);
}
while (1)
{
bool g1 = 0;
for (int i = 0; i <= n; i++)
{
ans1.pb({});
ans1.back().resize(n + 1);
vc.clear();
g = 1;
Rec(i, 0, 0);
if (g)
{
g1 = 1;
break;
}
ans1.pop_back();
for (auto j : vc) mrk[j.f][j.s] = 0;
}
if (!g1) break;
}
int k = ans1.size();
for (int x1 = 0; x1 < M; x1++)
{
int x = rand() % (1 << n);
bool g = 1;
for (int i = 0; i <= n; i++)
for (auto j : a[i]) g &= !mrk[min(ans1[ps][i] ^ x, ans1[ps][j] ^ x)][max(ans1[ps][i] ^ x, ans1[ps][j] ^ x)];
for (int ps = 0; ps < k; ps++)
{
if (g)
{
ans1.pb(ans1[ps]);
for (int i = 0; i <= n; i++) ans1.back()[i] ^= x;
for (int i = 0; i <= n; i++)
for (auto j : a[i]) mrk[min(ans1.back()[i], ans1.back()[j])][max(ans1.back()[i], ans1.back()[j])] = 1;
}
}
}
cout << ans1.size() << endl;
for (auto i : ans1)
{
for (auto j : i) cout << j << " ";
cout << endl;
}
}
/*
5 3
2 1 1 2 2 3
2 3 3 4 4 5
4 1 1 2 2 3 3 4 4 5
*/
Compilation message
Main.cpp: In function 'int main()':
Main.cpp:93:52: error: 'ps' was not declared in this scope; did you mean 's'?
93 | for (auto j : a[i]) g &= !mrk[min(ans1[ps][i] ^ x, ans1[ps][j] ^ x)][max(ans1[ps][i] ^ x, ans1[ps][j] ^ x)];
| ^~
| s
