Submission #55223

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
55223	2018-07-06T12:29:48 Z	linkret	Sailing Race (CEOI12_race)	C++14	70 / 100	1323 ms	6268 KB

race

#include <bits/stdc++.h>

using namespace std;

const int maxn = 505, inf = 1e9;

int n, id;
vector<int> adj[maxn];
vector<int> radj[maxn];

bool between(int l, int r, int i) {
	if(l > r) {
		return i >= l || i <= r;
	} else {
		return i >= l && i <= r;
	}
}

int dist(int i, int j) {
	if(i <= j)
		return j - i;
	return n - i + j;
}

int dp[2][2][maxn][maxn];
int f[maxn][maxn];

int main() {
	ios_base::sync_with_stdio(false);

	cin >> n >> id;

	for(int i = 0, j; i < n; i++) {
		while(true) {
			cin >> j;
			if(!j) break;
			j--;
			adj[i].push_back(j);
			radj[j].push_back(i);
		}
	}

	for(int i = 0; i < n; i++) {
		for(int j = 0; j < n; j++) {
			f[i][j] = -1;

			for(int k : radj[i]) {
				if(between(j, i, k))
					continue;

				if(f[i][j] == -1)
					f[i][j] = k;

				if(dist(i, f[i][j]) < dist(i, k))
					f[i][j] = k;
			}
		}
	}

	for(int i = 0; i < n; i++) {
		for(int j = 0; j < n; j++) {
			dp[1][0][i][j] = -inf;
			dp[1][1][i][j] = -inf;
		}
	}

	for(int i = 0; i < n; i++) {
		dp[1][0][i][i] = 0;
		dp[1][1][i][i] = 0;
	}

	for(int len = 1; len < n; len++) {
		for(int i = 0; i < n; i++) {
			int j = (i + len) % n;
			
			for(int k : radj[j]) {
				if(between(i, j, k)) {
					dp[1][0][i][j] = max(dp[1][0][i][j], 1 + dp[1][0][i][k]);
				}
			}

			for(int k : radj[i]) {
				if(between(i, j, k)) {
					dp[1][1][i][j] = max(dp[1][1][i][j], 1 + dp[1][1][k][j]);
				}
			}

			for(int k : adj[i]) {
				if(between(i, j, k)) {
					dp[0][0][i][j] = max(dp[0][0][i][j], 1 + max(dp[0][1][(i + 1) % n][k], dp[0][0][k][j]));
				}
			}

			for(int k : adj[j]) {
				if(between(i, j, k)) {
					dp[0][1][i][j] = max(dp[0][1][i][j], 1 + max(dp[0][1][i][k], dp[0][0][k][(j - 1 + n) % n]));
				}
			}
		}
	}

	int mxm = 0, t = 0;

	for(int i = 0; i < n; i++) {
		int tmp = dp[0][0][i][(i - 1 + n) % n];
		if(tmp > mxm) {
			mxm = tmp;
			t = i;
		}
	}

	if(id) {
		for(int i = 0; i < n; i++) {
			for(int j = 0, l; j < n; j++) {
				if(i == j)
					continue;

				for(int k : adj[j]) {
					if(i == k || j == k)
						continue;

					if(between(j, k, i)) 
						l = f[i][j];
					else
						l = f[i][k];

					if(l == i || l == j || l == k || l == -1)
						continue;

					if(between(j, k, i)) {
						int tmp = 0;

						if(between(k, j, l)) {
							tmp = dp[1][1][j][i] + 2 + max(dp[0][1][(i + 1) % n][k], dp[0][0][k][l]);
						} else {
							// tmp = dp[1][1][j][i] + 2 + max(dp[0][1][(i + 1) % n][k], dp[0][0][k][(j - 1 + n) % n]);
						}

						// if(tmp == 6) {
						// 	cout << i << " " << j << " " << k << ", l je " << l << endl;
						// }
					
						if(tmp > mxm) {
							mxm = tmp;
							t = l;
						}
					} else {
						// int tmp = 0;

						// if(between(k, j, l)) {
						// 	tmp = dp[1][1][j][i] + 2 + max(dp[0][1][(i + 1) % n][k], dp[0][0][k][l]);
						// } else {
						// 	// tmp = dp[1][1][j][i] + 2 + max(dp[0][1][(i + 1) % n][k], dp[0][0][k][(j - 1 + n) % n]);
						// }

						// // if(tmp == 6) {
						// // 	cout << i << " " << j << " " << k << ", l je " << l << endl;
						// // }
						
						// if(tmp > mxm) {
						// 	mxm = tmp;
						// 	t = l;
						// }
					}
				}
			}
		}
	}

	cout << mxm << endl << t + 1 << endl;

	// for(int i = 0; i < n; i++) {
	// 	for(int j = 0; j < n; j++) {
	// 		int k = dp[0][1][i][j];
	// 		if(k < 0)
	// 			cout << 'x' << " ";
	// 		else
	// 			cout << k << " ";
	// 	}
	// 	cout << endl;
	// }

	// for(int i = 0; i < n; i++) {
	// 	for(int j = 0; j < n; j++) {
	// 		cout << f[i][j] << " ";
	// 	}
	// 	cout << endl;
	// }

	return 0;
}

Subtask #1

70.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	380 KB	Output is correct
2	Incorrect	3 ms	740 KB	Output isn't correct
3	Incorrect	3 ms	900 KB	Output isn't correct
4	Correct	3 ms	960 KB	Output is correct
5	Correct	5 ms	1348 KB	Output is correct
6	Correct	7 ms	1348 KB	Output is correct
7	Correct	11 ms	1348 KB	Output is correct
8	Incorrect	8 ms	1348 KB	Output isn't correct
9	Correct	10 ms	1468 KB	Output is correct
10	Correct	26 ms	1596 KB	Output is correct
11	Correct	14 ms	1600 KB	Output is correct
12	Correct	54 ms	2796 KB	Output is correct
13	Incorrect	104 ms	3708 KB	Output isn't correct
14	Correct	161 ms	4724 KB	Output is correct
15	Incorrect	659 ms	6012 KB	Output isn't correct
16	Correct	850 ms	6268 KB	Output is correct
17	Incorrect	830 ms	6268 KB	Output isn't correct
18	Correct	244 ms	6268 KB	Output is correct
19	Correct	1323 ms	6268 KB	Output is correct
20	Correct	1139 ms	6268 KB	Output is correct