Submission #1049244

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049244		sofija6	Beautiful row (IZhO12_beauty)	C++14	100 / 100	578 ms	172788 KiB

beauty

#include <bits/stdc++.h>
#define ll long long
#define MAXN 21
using namespace std;
ll a[MAXN],dp[1<<MAXN][MAXN];
bool ok[MAXN][MAXN];
ll Count(ll x)
{
    ll cur=387420489ll,cnt=0;
    while (x)
    {
        if (x/cur==1)
            cnt++;
        x%=cur;
        cur/=3;
    }
    return cnt;
}
bool Check(ll x,ll y)
{
    if (__builtin_popcount(x)==__builtin_popcount(y))
        return true;
    if (Count(x)==Count(y))
        return true;
    return false;
}
int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n;
    cin >> n;
    for (ll i=0;i<n;i++)
    {
        cin >> a[i];
        dp[1<<i][i]=1;
    }
    for (ll i=0;i<n;i++)
    {
        for (ll j=0;j<n;j++)
            ok[i][j]=Check(a[i],a[j]);
    }
    for (ll i=1;i<(1<<n);i++)
    {
        for (ll j=0;j<n;j++)
        {
            if (!((1<<j)&i))
                continue;
            for (ll k=0;k<n;k++)
            {
                if ((1<<k)&i || !ok[j][k])
                    continue;
                dp[i|(1<<k)][k]+=dp[i][j];
            }
        }
    }
    ll ans=0;
    for (ll i=0;i<n;i++)
        ans+=dp[(1<<n)-1][i];
    cout << ans;
    return 0;
}

• Subtask 1: 100 / 100