Submission #716444

#	Time	Username	Problem	Language	Result	Execution time	Memory
716444		vjudge1	Beautiful row (IZhO12_beauty)	C++17	0 / 100	6 ms	7380 KiB

beauty

// #pragma GCC target( "sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
// #pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")  
#include<bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define sz(x) (int)x.size()
#define bit(a, i) ((a>>i)&1)

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll; 
typedef pair<int, int> pii;

const int P = 5;
const int K = 110;
const ll inf = 1e18;
const int mod = 1e9 + 7;
const int maxn = 3e5 + 100;
const int dx[] = {0, 0, -1, 1};
const int dy[] = {-1, 1, 0, 0};
const string C[] = {"NO\n", "YES\n"};   

int n;
int a[maxn];
vector<int>g[maxn];
ll dp[20][(1<<20)];
    
bool ok(int x, int y){
    if(__builtin_popcount(x) == __builtin_popcount(y)) return 1;
    int cnt = 0;
    while(x){
        if(x%3 == 1) cnt++;
        x /= 3;
    }
    while(y){
        if(y%3 == 1) cnt--;
        y /= 3;
    }
    return (cnt == 0);
}

int main(){
    freopen("b.in", "r", stdin);
    freopen("b.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n;
    for(int i=0; i<n; i++){
        cin >> a[i];
    }
    for(int i=0; i<n; i++){
        for(int j=0; j<n; j++){
            if(ok(a[i], a[j])){
                g[i].pb(j);
            }
        }
        dp[i][1<<i] = 1;
    }
    for(int mask=1; mask<(1<<n); mask++){
        for(int i=0; i<n; i++){
            if(!bit(mask, i)) continue;
            for(auto to: g[i]){
                if(bit(mask, to)) continue;
                dp[to][mask^(1<<to)] += dp[i][mask];
            }
        }
    }
    ll ans = 0;
    for(int i=0; i<n; i++) ans += dp[i][(1<<n)-1];
    cout << ans;
}    

Compilation message (stderr)

beauty.cpp: In function 'int main()':
beauty.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen("b.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
beauty.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen("b.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100