#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fr first
#define sc second
#define clr(a, x) memset(a, x, sizeof(a))
#define dbg(x) cout<<"("<<#x<<"): "<<x<<endl;
#define printvector(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout<<*it<<" "; cout<<endl;
#define all(v) v.begin(), v.end()
#define lcm(a, b) (a * b)/__gcd(a, b)
#define int long long int
#define printvecpairs(vec) for(auto it: vec) cout<<it.fr<<' '<<it.sc<<endl;
#define endl '\n'
#define float long double
const int MOD = 1e9 + 7;
const int INF = 2e15;
const int MAXN = 25;
int n;
int a[MAXN], b[MAXN], t[MAXN], dp[MAXN][2^21];
int check(int i, int j){
if(b[i] == b[j] || t[i] == t[j]) return true;
return false;
}
// int f(int i, int mask){
// if(mask == (1<<i)){
// return 1;
// }
// if(dp[i][mask] != -1){
// return dp[i][mask];
// }
// int res = 0;
// for(int j= 0;j<n;j++){
// if(!(mask & (1<<j)) || (j == i)) continue;
// if(check(i, j)){
// res += f(j, mask ^ (1<<i));
// }
// }
// return dp[i][mask] = res;
// }
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
#ifdef LOCAL
freopen("input.txt", "r", stdin);
#endif
cin>>n;
clr(dp, 0);
for(int i= 0;i<n;i++){
b[i] = 0;
t[i] = 0;
cin>>a[i];
int x = a[i];
while(x){
t[i] += ((x%3)==1);
x /= 3;
}
x = a[i];
while(x){
b[i] += ((x%2)==1);
x /= 2;
}
}
for(int i = 0;i<n;i++) dp[i][(1<<i)] = 1;
for(int mask = 0;mask<(1<<n);mask++){
for(int i= 0;i<n;i++){
if(!(mask & (1<<i))) continue;
for(int j= i+1;j<n;j++){
if(!(mask & (1<<j))) continue;
if(check(i, j)){
dp[i][mask] += dp[j][mask^(1<<i)];
dp[j][mask] += dp[i][mask^(1<<j)];
}
}
}
}
int ans = 0;
for(int i= 0;i<n;i++){
ans += dp[i][(1<<n)-1];
}
cout<<ans<<endl;
return 0;
}
| # |
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 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
