Submission #1086105

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086105		TrinhKhanhDung	Beautiful row (IZhO12_beauty)	C++14	100 / 100	385 ms	205648 KiB

beauty

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define sz(x) (int)x.size()
#define ALL(v) v.begin(),v.end()
#define MASK(k) (1LL << (k))
#define BIT(x, i) (((x) >> (i)) & 1)
#define oo (ll)1e18
#define INF (ll)1e9
#define MOD (ll)(998244353)

using namespace std;

template<class T1, class T2>
    bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;}

template<class T1, class T2>
    bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;}

template<class T1, class T2>
    void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;}

template<class T1, class T2>
    void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;}

template<class T>
    void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());}

void solve(){
    int n; cin >> n;
    vector<int> a(n + 3, 0);
    for(int i=0; i<n; i++){
        cin >> a[i];
    }
    vector<int> two(n + 3), three(n + 3, 0);
    for(int i=0; i<n; i++){
        two[i] = __builtin_popcount(a[i]);
        int x = a[i];
        while(x > 0){
            if(x % 3 == 1) three[i]++;
            x /= 3;
        }
    }

    vector<vector<ll>> f(MASK(n), vector<ll>(n, 0));
    for(int i=0; i<n; i++){
        f[MASK(i)][i] = 1;
    }

    for(int mask=1; mask<MASK(n); mask++){
        for(int tmp=mask; tmp>0; tmp-=tmp&-tmp){
            int i = __builtin_ctz(tmp);
            if(f[mask][i] > 0){
//                cout << mask << ' ' << i << ' ' << f[mask][i] << '\n';
                for(int pr=MASK(n)-1-mask; pr>0; pr-=pr&-pr){
                    int j = __builtin_ctz(pr);
                    if(two[i] == two[j] || three[i] == three[j]){
                        f[mask | MASK(j)][j] += f[mask][i];
                    }
                }
            }
        }
    }

    ll ans = 0;
    for(int i=0; i<n; i++){
        ans += f[MASK(n) - 1][i];
    }

    cout << ans << '\n';
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
//    freopen("numtable.inp","r",stdin);
//    freopen("numtable.out","w",stdout);

    solve();

    return 0;
}

• Subtask 1: 100 / 100