Submission #857579

#	Time	Username	Problem	Language	Result	Execution time	Memory
857579		Mohamed_Kachef06	Beautiful row (IZhO12_beauty)	C++17	0 / 100	3017 ms	164696 KiB

beauty

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define A first
#define B second

int n ,  a[20] , dp[20][1<<20] , co[20][20]; 

int fact(int i , int b){
    int x = a[i];
    int ans =0 ;
    while(x > 0){
        if (x%b == 1) ans++;
        x/=b;
    }
    return ans;
}

void pre(){
    for (int i = 0 ; i < n ; i++) {
        for (int j = 0 ; j < i ; j++){
            int a = fact(i ,2), b = fact(i , 3) , c = fact(j ,2 ) , d= fact(j , 3);
            if (a == c || b == d)  { co[i][j] = 1; co[j][i] = 1;}
        }
    }
}

int brute(int last , int mask , set<int> &st){
    if ( mask == (1<<n) - 1) return 1;
    if (~dp[last][mask]) return dp[last][mask];
    int ans = 0 ;
    for (auto i = st.begin() ; i!=st.end() ; i++){
        if (!(mask & (1<<*i))){ 
          if (mask == 0 || co[last][*i]) {
            set<int> b = st;
            b.erase(*i);
            ans += brute(*i , (mask | 1<<*i) , b);
          }
        }
    }
    return dp[last][mask] =  ans;
}

signed main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 0 ; i < n ; i++) cin >> a[i];
    memset(dp , -1 , sizeof dp);
    pre();
    set<int> st; 
    for (int i = 0 ; i < n ; i++) st.insert(i);
    cout << brute(0 , 0 , st); 
}

• Subtask 1: 0 / 100