Submission #673983

#	Time	Username	Problem	Language	Result	Execution time	Memory
673983		Cutebol	Beautiful row (IZhO12_beauty)	C++17	100 / 100	2347 ms	205512 KiB

beauty

#include <bits/stdc++.h>
 
using namespace std;
 
void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define Scaramouche ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0);
#define int long long
#define itn int
#define endl "\n"
#define ff first
#define ss second
   
const int N = 25 + 5 ;
const int mod = 1e9 + 7 ;
const int inf = 1e9 ;

int n ;
int a[N] , b[N] , dp[(1<<20)+5][25] ;

int func(int x){
	int res = 0 ;
	while ( x ){
		res += ( x % 3 == 1 ) ;
		x /= 3 ;
	} 
	return res ;
}

int rec ( int mask , int last ){
	
	if ( __builtin_popcount(mask) == n ) return 1 ;
	if ( last != -1 && dp[mask][last] != -1 ) return dp[mask][last] ;
	int ans = 0 ;
	for ( int i = 0 ; i < n ; i ++ ){
		if ( mask&(1<<i) ) continue ;
		if ( last == -1 || a[i] == a[last] || b[i] == b[last] ) ans += rec( mask|(1<<i) , i ) ;
	}
	return dp[mask][last] = ans ;
	
}

void solve(){
	
	cin >> n ;
	for ( int i = 0 ; i < n ; i ++ ){
		int x ;
		cin >> x ;
		a[i] = __builtin_popcount(x) ;
		b[i] = func(x) ;
	}
	
	memset( dp , -1 , sizeof(dp) ) ;
	cout << rec( 0 , -1 ) ;
}
 
signed main(){
//  fopn("blocks") ;
    Scaramouche ;
    int t = 1 ;
//    	cin >> t ;
    while ( t -- ) solve() ; 
}

Compilation message (stderr)

beauty.cpp: In function 'void fopn(std::string)':
beauty.cpp:5:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:5:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100