#include<bits/stdc++.h>
using namespace std ;
const int N =20 + 1 ;
int n;
int r2[N] , r3[N] ;
int a[N] ;
vector<int> p ;
long long dp[N][(1<<N) + 7] ;
int solve1(int x , int base){
int ret = 0 ;
while(x){
ret+= (x%base==1) ;
x/=base ;
}
return ret ;
}
vector<int> adj[N] ;
long long solve(int x , int mask){
if(dp[x][mask]!= -1)
return dp[x][mask] ;
if(mask == (1<<n) -1){
return 1LL ;
}
long long ret = 0 ;
for(auto u : adj[x]){
if(mask&(1<<u))
continue ;
ret += solve(u , (mask|(1<<u))) ;
}
return dp[x][mask] = ret ;
}
int main(){
ios_base::sync_with_stdio(0) ;
cin.tie(0) ;
//freopen("in.in" , "r" , stdin) ;
cin>>n ;
memset(dp , -1 , sizeof dp) ;
for(int i = 0 ;i < n;i++){
cin>>a[i] ;
r2[i] = solve1(a[i] , 2) ;
r3[i] = solve1(a[i] , 3) ;
}
for(int i = 0 ;i < n;i++){
p.push_back(i) ;
}
for(int i = 0 ;i < n;i++){
for(int j = i+1 ;j < n;j++){
if(r2[i] == r2[j] || r3[i] == r3[j]){
adj[i].push_back(j) ;
adj[j].push_back(i) ;
}
}
}
long long ans = 0 ;
for(int i = 0 ;i < n;i++){
ans += solve(i , (1<<i)) ;
}
cout<< ans ;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
129 ms |
262148 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
