제출 #848295

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
848295		wakandaaa	아름다운 순열 (IZhO12_beauty)	C++17	100 / 100	1837 ms	158420 KiB

beauty

#include <bits/stdc++.h>

using namespace std;

#define file ""

#define mp make_pair
#define fi first
#define se second
#define all(x) x.begin(), x.end()

#define getbit(x, i) (((x) >> (i)) & 1)
#define bit(x) (1LL << (x))
#define popcount __builtin_popcountll

mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
    return l + rd() % (r - l + 1);
}

const int N = 20;
const int mod = (int)1e9 + 7; // 998244353;
const int lg = 25; // lg + 1
const int oo = 1e9;
const long long ooo = 1e18;

template<class X, class Y> bool mini(X &a, Y b) {
    return a > b ? (a = b, true) : false;
}
template<class X, class Y> bool maxi(X &a, Y b) {
    return a < b ? (a = b, true) : false;
}
void add(int &a, int b) {
    a += b;
    if (a >= mod) a -= mod;
    if (a < 0) a += mod;
}

int n;
int a[N], b[N];
long long f[N][1 << N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);

    cin >> n;
    for (int i = 0; i < n; ++i) {
    	int x;
    	cin >> x;
    	a[i] = popcount(x);
    	while (x) {
    		if (x % 3 == 1) ++b[i];
    		x /= 3;
    	}
    }

    for (int i = 0; i < n; ++i) f[i][bit(i)] = 1;
    for (int mask = 0; mask < bit(n); ++mask) {
    	for (int i = 0; i < n; ++i) if (getbit(mask, i)) {
    		for (int j = 0; j < n; ++j) if (getbit(mask, j)) {
    			if (a[i] == a[j] || b[i] == b[j])
    				f[i][mask] += f[j][mask ^ bit(i)];
    		}
    	}
    }

    long long res = 0;
    for (int i = 0; i < n; ++i) res += f[i][bit(n) - 1];

    cout << res;

    return 0;
}

/*

*/

• Subtask 1: 100 / 100