Submission #41235

#	Time	Username	Problem	Language	Result	Execution time	Memory
41235		IvanC	Beautiful row (IZhO12_beauty)	C++14	100 / 100	2905 ms	164708 KiB

beauty

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAXN = 20;
const int MAXL = (1 << 20);
ll dp[MAXN][MAXL];
int adj[MAXN],qtd[MAXN][2],alvo,n;
ll solve(int pos,int bitmask){
	if(bitmask == alvo){
		return 1;
	}
	if(dp[pos][bitmask] != -1) return dp[pos][bitmask];
	ll tot = 0;
	for(int nxt = 0;nxt<n;nxt++){
		if(((1 << nxt) & adj[pos]) && !((1 << nxt) & bitmask) ){
			tot += solve(nxt, (bitmask) | (1 << nxt) );
		}
	}
	return dp[pos][bitmask] = tot;
}
int main(){
	cin >> n;
	alvo = (1 << n) - 1;
	for(int i = 0;i<n;i++) memset(dp[i],-1,sizeof(dp[i]));
	for(int i = 0;i<n;i++){
		int x;
		cin >> x;
		int copia = x;
		int copia2 = x;
		for(int vez = 0;vez<31;vez++){
			if(copia % 2 == 1) qtd[i][0]++;
			copia /= 2;
			if(copia2 % 3 == 1) qtd[i][1]++;
			copia2 /= 3;
		}
		for(int j = 0;j<i;j++){
			if(qtd[i][0] == qtd[j][0]){
				adj[j] |= (1 << i);
				adj[i] |= (1 << j);
			}
			if(qtd[i][1] == qtd[j][1]){
				adj[j] |= (1 << i);
				adj[i] |= (1 << j);
			}
		}
	}
	ll tot = 0;
	for(int i = 0;i<n;i++) tot += solve(i,(1<<i));
	cout << tot << endl;
	return 0;
}

• Subtask 1: 100 / 100