Submission #90109

#	Time	Username	Problem	Language	Result	Execution time	Memory
90109		YottaByte	Beautiful row (IZhO12_beauty)	C++14	0 / 100	303 ms	704 KiB

beauty

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

const int N = 20;
int a[N + 1], n, ans;

inline bool count(int a, int b)
{
	int resa, resb;
	resa = resb = 0;
	
	while(a)
	{
		resa += (a % 3 == 1);
		a /= 3;
	}
	
	while(b)
	{
		resb += (b % 3 == 1);
		b /= 3;
	}
	return (resa == resb);
}

inline bool check()
{
	int c = 0;
	for(int i = 1; i < n; i++)
	{
		if(__builtin_popcount(a[i]) == __builtin_popcount(a[i + 1])) c++;
		else if(count(a[i], a[i + 1])) c++;
		else return false;
	}
	return true;
}

void out()
{
	for(int i = 1; i <= n; i++)
	{
		cout << a[i] << " ";
	}
}

main()
{
	cin >> n;
	for(int i = 1; i <= n; i++)
	{
		cin >> a[i];
	}
	
	sort(a + 1, a + 1 + n);
	
	do
	{
		if(check())
			ans++;
	} while(next_permutation(a + 1, a + 1 + n));
	
	cout << ans << endl;
}

Compilation message (stderr)

beauty.cpp:46:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^

• Subtask 1: 0 / 100