Submission #132356

#	Time	Username	Problem	Language	Result	Execution time	Memory
132356		anayk	Dojave (COCI17_dojave)	C++14	140 / 140	291 ms	36256 KiB

dojave

#include <iostream>

#define MAXN 2000000

int m, n;
int first[MAXN];
int other[MAXN];
int seq[MAXN];
long long dp[2][MAXN];
int min, max;
int a, b;

void add(int x)
{
	min = std::min(x, min);
	max = std::max(x, max);
}

void solve(int l, int r)
{
	int m = (l+r)/2;

	a = m;
	b = m+1;

	min = a;
	max = b;

	add(other[seq[a]]);
	add(other[seq[b]]);

	while(true)
	{
		if(a > min)
		{
			if(a == l)
				break;

			a--;
			add(other[seq[a]]);
		}
		else if(b < max)
		{
			if(b == r)
				break;

			b++;
			add(other[seq[b]]);
		}
		else
		{
			first[a] = std::min(first[a], b);

			if(a == l)
				break;

			a--;
			add(other[seq[a]]);
		}
	}
}

int main()
{
	std::ios::sync_with_stdio(false);

	std::cin >> m;
	n = (1 << m);

	if(m == 1)
	{
		std::cout << 2 << std::endl;
		return 0;
	}

	for(int i = 0; i < n; i++)
	{
		std::cin >> seq[i];
		first[i] = MAXN;
		other[seq[i]^(n-1)] = i;
	}

	int c = 2;
	while(c <= n)
	{
		for(int i = 0; i < n; i+=c)
			solve(i, i+c-1);
		c *= 2;
	}

	long long answer = n;
	answer *= (answer-1);
	answer /= 2;
	answer += (long long) n;

	dp[0][n] = dp[1][n] = 0;

	for(int i = n-1; i >= 0; i--)
	{
		dp[0][i] = dp[1][i] = 0;
		
		if(first[i] == MAXN)
			continue;

		int c = first[i]-i+1;
		if(c%4)
		{
			dp[1][i] = 1;
			dp[1][i] += dp[0][first[i]+1];
			dp[0][i] += dp[1][first[i]+1];
		}
		else
		{
			dp[0][i] = 1;
			dp[1][i] += dp[1][first[i]+1];
			dp[0][i] += dp[0][first[i]+1];
		}

		answer -= dp[0][i];
	}

	std::cout << answer << std::endl;

	return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14