Submission #1266127

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266127		kaiboy	Sailing Race (CEOI12_race)	C++20	In queue	0 ms	0 KiB

race

#include <algorithm>
#include <iostream>

using namespace std;

const int N = 500;

bool aa[N][N];
int dp[N][N][2], dq[N][N];

int main() {
	ios_base::sync_with_stdio(false), cin.tie(NULL);
	int n, c; cin >> n >> c;
	if (n == 1) {
		cout << "0\n";
		cout << "1\n";
		return 0;
	}
	for (int i = 0; i < n; i++)
		while (true) {
			int j; cin >> j, j--;
			if (j == -1)
				break;
			aa[i][j] = true;
		}
	for (int d = 1; d <= n; d++)
		for (int l = 0; l < n; l++) {
			int r = (l + d) % n;
			for (int h = 0; h < 2; h++) {
				int i = h ? r : l, x = 0;
				for (int j = (l + 1) % n; j != r; j = (j + 1) % n)
					if (aa[i][j])
						x = max(x, max(dp[l][j][1], dp[j][r][0]) + 1);
				dp[l][r][h] = x;
			}
		}
	int x_ = -1, s_ = -1;
	for (int s = 0; s < n; s++) {
		int x = dp[s][s][0];
		if (x_ < x)
			x_ = x, s_ = s;
	}
	if (!c) {
		cout << x_ << '\n';
		cout << s_ + 1 << '\n';
		return 0;
	}
	for (int s = 0; s < n; s++) {
		dq[s][s] = 0;
		for (int i = (s + 1) % n; i != s; i = (i + 1) % n) {
			int x = -1;
			for (int j = s; j != i; j = (j + 1) % n)
				if (aa[j][i] && dq[s][j] != -1)
					x = max(x, dq[s][j] + 1);
			dq[s][i] = x;
		}
	}
	for (int i = 0; i < n; i++)
		for (int j = (i + 1) % n; j != i; j = (j + 1) % n) {
			if (dq[i][j] == -1)
				continue;
			int s = (j + 1) % n;
			while (s != i && !aa[s][i])
				s = (s + 1) % n;
			if (s == i)
				continue;
			int x = 0;
			for (int k = (s + 1) % n; k != i; k = (k + 1) % n)
				if (aa[j][k])
					x = max(x, max(dp[s][k][1], dp[k][i][0]) + 1);
			x += dq[i][j] + 1;
			if (x_ < x)
				x_ = x, s_ = s;
		}
	for (int s = 0; s < n; s++) {
		dq[s][s] = 0;
		for (int i = (s - 1 + n) % n; i != s; i = (i - 1 + n) % n) {
			int x = -1;
			for (int j = s; j != i; j = (j - 1 + n) % n)
				if (aa[j][i] && dq[s][j] != -1)
					x = max(x, dq[s][j] + 1);
			dq[s][i] = x;
		}
	}
	for (int i = 0; i < n; i++)
		for (int j = (i - 1 + n) % n; j != i; j = (j - 1 + n) % n) {
			if (dq[i][j] == -1)
				continue;
			int s = (j - 1 + n) % n;
			while (s != i && !aa[s][i])
				s = (s - 1 + n) % n;
			if (s == i)
				continue;
			int x = 0;
			for (int k = (i + 1) % n; k != s; k = (k + 1) % n)
				if (aa[j][k])
					x = max(x, max(dp[i][k][1], dp[k][s][0]) + 1);
			x += dq[i][j] + 1;
			if (x_ < x)
				x_ = x, s_ = s;
		}
	cout << x_ << '\n';
	cout << s_ + 1 << '\n';
	return 0;
}