Submission #163497

#	Time	Username	Problem	Language	Result	Execution time	Memory
163497		tselmegkh	Beautiful row (IZhO12_beauty)	C++14	0 / 100	2 ms	376 KiB

beauty

#include<bits/stdc++.h>
using namespace std;

vector<int> binary[33], trinary[33];
vector<int> a;
int n;
bool same[25], block[25];

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

map<string, bool> calc;
bool vis[(1 << 20)][21];
int solve(int i, int mask, string cur, int last){
	if(i == n){
		//cout << cur << '\n';
		if(calc[cur])return 0;
		calc[cur] = 1;
		return 1;
	}
	int ans = 0;
	if(vis[mask][last])return 0;
	vis[mask][last] = 1;
	if(i == 0){
		for(int j = 0; j < n; j++){
			int curmask = mask | (1 << j);
			string tmp;
			tmp += a[j] + '0';
			ans += solve(i + 1, curmask, tmp, j);
		}
	}else{
		int binaryones = __builtin_popcount(a[last]), trinaryones = count(a[last]);
		for(int j = 0; j < binary[binaryones].size(); j++){
			int k = binary[binaryones][j];
			if(mask & (1 << k))continue;
			int curmask = mask | (1 << k);
			string tmp = cur;
			tmp += a[k] + '0';
			ans += solve(i + 1, curmask, tmp, k);
		}
		for(int j = 0; j < trinary[trinaryones].size(); j++){
			int k = trinary[trinaryones][j];
			if(mask & (1 << k))continue;
			string tmp = cur;
			tmp += a[k] + '0';
			int curmask = mask | (1 << k);
			ans += solve(i + 1, curmask, tmp, k);
		}
	}
	return ans;
}
int main(){
	cin >> n;
	a.resize(n);

	for(int i = 0; i < n; i++){
		cin >> a[i];
		int cnt3 = count(a[i]), cnt2 = __builtin_popcount(a[i]);
		binary[cnt2].push_back(i);
		trinary[cnt3].push_back(i);
	}

	cout << solve(0, 0, "", -1) << '\n';
}

Compilation message (stderr)

beauty.cpp: In function 'int solve(int, int, std::__cxx11::string, int)':
beauty.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0; j < binary[binaryones].size(); j++){
                  ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:49:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0; j < trinary[trinaryones].size(); j++){
                  ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100