#include<bits/stdc++.h>
using namespace std;
void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
cerr << h; if(sizeof...(t)) cerr << ", ";
DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL
#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"
using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;
void setIO(string NAME = "") {
cin.tie(0)->sync_with_stdio(0);
if(sz(NAME)) {
freopen((NAME + ".inp").c_str(),"r",stdin);
freopen((NAME + ".out").c_str(),"w",stdout);
}
}
constexpr bool onbit(int x, int i) { return x>>i&1;}
const int MX = 25;
int cnt[2][MX], N;
ll dp[1<<20][20];
bool ok(int i, int j) {
F0R(ind1,2) F0R(ind2,2) if(cnt[ind1][i] == cnt[ind2][j]) return true;
return false;
}
void solve() {
cin>>N;
F0R(i,N) {
int val;
cin>>val;
cnt[0][i] = __builtin_popcount(val);
while(val > 0) {
cnt[1][i] += (val%3 == 1);
val /= 3;
}
}
F0R(i,N) dp[1<<i][i] = 1;
F0R(msk, 1<<N) {
F0R(i,N) if(onbit(msk, i) && dp[msk][i] > 0) {
F0R(j,N) if(!onbit(msk, j) && ok(i,j)) {
dp[msk|(1<<j)][j] += dp[msk][i];
}
}
}
ll ans = 0;
F0R(i,N) ans += dp[(1<<N)-1][i];
cout << ans << nl;
}
int main() {
setIO();
int t=1;
//cin>>t;
while(t-->0) {
solve();
}
return 0;
}
Compilation message
beauty.cpp: In function 'void setIO(std::string)':
beauty.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
37 | freopen((NAME + ".inp").c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
38 | freopen((NAME + ".out").c_str(),"w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
324 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
