/*
Code written by Talant I.D.
*/
//#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
//typedef tree <int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
inline bool isvowel(char ch){
ch = tolower(ch);
return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
inline bool isprime(int n){
if(n < 2 || (n%2 == 0 && n != 2)) return false;
for(int i = 3; i*i <= n; i++)
if(n%i == 0) return false;
return true;
}
class Union{
private:
vector <int> saizu, link;
public:
Union(int n){
saizu.assign(n, 1); link.resize(n);
iota(all(link), 0);
}
int find(int n){
if(link[n] == n) return n;
return link[n] = find(link[n]);
}
int same(int a, int b){
return find(a) == find(b);
}
void unite(int a, int b){
if(same(a, b)) return;
a = find(a); b = find(b);
if(saizu[a] < saizu[b]) swap(a, b);
saizu[a] += saizu[b];
link[b] = a;
}
int getsize(int a){
return saizu[find(a)];
}
};
const int mod = 1e9+7;
ll mode(ll a){
a %= mod;
if(a < 0) a += mod;
return a;
}
ll subt(ll a, ll b){
return mode(mode(a)-mode(b));
}
ll add(ll a, ll b){
return mode(mode(a)+mode(b));
}
ll mult(ll a, ll b){
return mode(mode(a)*mode(b));
}
ll binpow(ll a, ll b){
ll res = 1;
while(b){
if(b&1) res = mult(res, a);
a = mult(a, a);
b >>= 1;
}
return res;
}
int used[23], n;
ll ans;
vector <set <int>> graph(23);
set <int> st;
void dfs(int v){
used[v] = 1;
for(auto to : graph[v]){
if(!used[to]){
dfs(to);
}
}
used[v] = 2;
}
void dfs2(int v){
st.insert(v);
if(sz(st) == n) ans++;
for(auto to : graph[v]){
if(!binary_search(all(st), to)){
dfs2(to);
}
}
st.erase(st.find(v));
}
int main(){
do_not_disturb
cin >> n;
vector <ll> v(n), bin(n), tern(n);
for(auto &to : v) cin >> to;
clock_t start = clock();
for(int i = 0; i < n; i++){
int to = v[i];
for(int bit = 30; bit >= 0; bit--)
if(to&(1<<bit)) bin[i]++;
for(int bit = 30; bit >= 0; bit--){
if(to/(ll)pow(3ll, bit) == 1) tern[i]++;
to %= (ll)pow(3ll, bit);
}
}
for(int i = 0; i < n; i++){
for(int j = i+1; j < n; j++){
if(bin[i] == bin[j] || tern[i] == tern[j]){
graph[i].insert(j);
graph[j].insert(i);
}
}
}
dfs(0);
for(int i = 0; i < n; i++){
if(!used[i]){
cout << 0;
return 0;
}
used[i] = 0;
}
vector <int> leaves;
for(int i = 0; i < n; i++){
if(sz(graph[i]) == 1){
leaves.pb(i);
}
}
if(sz(leaves) > 2){
cout << 0;
return 0;
}
if(sz(leaves)){
for(auto to : leaves){
dfs2(to);
}
}
else{
for(int i = 0; i < n; i++){
dfs2(i);
}
}
cout << ans << endl;
return 0;
}
Compilation message
beauty.cpp: In function 'int main()':
beauty.cpp:133:13: warning: unused variable 'start' [-Wunused-variable]
133 | clock_t start = clock();
| ^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
