제출 #857579

#제출 시각아이디문제언어결과실행 시간메모리
857579Mohamed_Kachef06아름다운 순열 (IZhO12_beauty)C++17
0 / 100
3017 ms164696 KiB
#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); }
#Verdict Execution timeMemoryGrader output
Fetching results...