답안 #55225

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
55225 2018-07-06T12:37:45 Z linkret Sailing Race (CEOI12_race) C++14
40 / 100
1821 ms 7228 KB
#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[2][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[0][i][j] = -1;
			f[1][i][j] = -1;

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

				if(f[0][i][j] == -1)
					f[0][i][j] = k;

				if(dist(i, f[0][i][j]) < dist(i, k))
					f[0][i][j] = k;
			}

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

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

				if(dist(i, f[1][i][j]) > dist(i, k))
					f[1][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[0][i][j];
					else
						l = f[1][i][j];

					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]);
						}
					
						if(tmp > mxm) {
							mxm = tmp;
							t = l;
						}
					} else {
						int tmp = 0;

						if(between(j, k, l)) {
							tmp = dp[1][0][i][j] + 2 + max(dp[0][0][k][(i - 1 + n) % n], dp[0][1][k][l]);
						}
						
						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;
}
# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 KB Output is correct
2 Incorrect 2 ms 680 KB Output isn't correct
3 Incorrect 2 ms 748 KB Output isn't correct
4 Incorrect 4 ms 972 KB Output isn't correct
5 Correct 4 ms 1148 KB Output is correct
6 Incorrect 6 ms 1280 KB Output isn't correct
7 Correct 12 ms 1408 KB Output is correct
8 Incorrect 6 ms 1484 KB Output isn't correct
9 Correct 13 ms 1616 KB Output is correct
10 Correct 27 ms 1792 KB Output is correct
11 Correct 16 ms 1792 KB Output is correct
12 Incorrect 64 ms 3088 KB Output isn't correct
13 Incorrect 117 ms 4144 KB Output isn't correct
14 Correct 150 ms 5552 KB Output is correct
15 Incorrect 1031 ms 7008 KB Output isn't correct
16 Incorrect 1276 ms 7092 KB Output isn't correct
17 Incorrect 1045 ms 7092 KB Output isn't correct
18 Correct 253 ms 7092 KB Output is correct
19 Incorrect 1499 ms 7228 KB Output isn't correct
20 Incorrect 1821 ms 7228 KB Output isn't correct