#include <bits/stdc++.h>
using namespace std ;
const int MAX = 21 ;
int arr[MAX] ;
int n ;
int cnt2[MAX] , cnt3[MAX] ;
int calc(int x)
{
int cnt = 0 ;
while(x > 0)
{
cnt += (x%3 == 1) ;
x /= 3 ;
}
return cnt ;
}
long long dp[MAX][(1 << MAX)] ;
long long solve(int idx , int mask)
{
if(mask == (1 << n) - 1)
return 1 ;
long long &ret = dp[idx][mask] ;
if(ret != -1)
return ret ;
ret = 0 ;
for(int i = 0 ; i < n ; ++i)
{
if((mask & (1 << i)))
continue ;
if(cnt2[i] == cnt2[idx] || cnt3[i] == cnt3[idx])
ret += solve(i , mask | (1 << i)) ;
}
return ret ;
}
int main()
{
memset(dp , -1 , sizeof(dp)) ;
ios_base::sync_with_stdio(0) ;
cin.tie(0) ;
cin>>n ;
for(int i = 0 ; i < n ; ++i)
cin>>arr[i] ;
for(int i = 0 ; i < n ; ++i)
cnt2[i] = __builtin_popcount(arr[i]) , cnt3[i] = calc(arr[i]) ;
long long ans = 0 ;
for(int i = 0 ; i < n ; ++i)
ans += solve(i , 1 << i) ;
return cout<<ans<<"\n" , 0 ;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
101 ms |
262144 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
