#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define yes "YES"
#define no "NO"
#define bigg INT_MAX
#define debug(x) cout<<(#x)<<" = " <<x<<endl;
#define all(x) x.begin(),x.end()
#define sz size()
#define nn '\n'
#define mms(x,y) memset(x,y,sizeof(x))
#define forr(i,j,n) for (int i=j; i<n; i++)
#define forn(i,j,n) for (int i=j; i>n; i--)
#define fi first
#define se second
#define la "LA"
#define cinn(x,y) for(int i=0; i<y; i++) cin>>x[i];
#define pii pair<int,int>
map<int,int> m2;
map<int,int> m3;
int n;
int dp[21][(1<<21)];
int dfs(int x, int mask)
{
if (mask==((1<<n)-1)) return 1;
if (dp[x][mask]!=-1) return dp[x][mask];
int c=0;
forr(i,0,n)
{
if (m2[x]==m2[i] || m3[x]==m3[i]){
if (!((1<<i)&mask))
{
mask|=(1<<i);
c+=dfs(i,mask);
mask^=(1<<i);
}
}
}
return dp[x][mask]=c;
}
signed main()
{
// #ifndef LOCAL
// freopen("lifeguards.in","r",stdin);
// freopen("lifeguards.out","w", stdout);
// #endif
fast
// int n;
cin>>n;
int a[n];
mms(dp,-1);
forr(i,0,n)
{
cin>>a[i];
int x=a[i];
while(x>0)
{
if (x%2==1) m2[i]++;
x/=2;
}
x=a[i];
while(x>0)
{
if (x%3==1) m3[i]++;
x/=3;
}
}
int ans=0;
forr(i,0,n)
{
ans+=dfs(i,(1<<i));
}
cout<<ans;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
99 ms |
262144 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
