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Submission #255860

# Submission time Handle Problem Language Result Execution time Memory
255860 2020-08-02T02:17:11 Z ttnhuy313 Sailing Race (CEOI12_race) C++14
100 / 100
 1284 ms 6672 KB 
#include <bits/stdc++.h>
using namespace std;

const int mxN=500;
int n, ai, dp1[mxN][mxN][2], dp2[mxN][mxN][2], dp3[mxN][mxN][2], b[mxN][2];
bool k, adj[mxN][mxN];
array<int, 2> ans;

void c(int l, int r, int a) {
	if(adj[l][r]) {
		dp1[l][r][a]=1;
		dp2[l][r][a]=1+dp3[r][b[l][a]][a^1];
	} else
		dp1[l][r][a]=dp2[l][r][a]=-n;
	for(int k=b[l][a]; k!=r; k=b[k][a]) {
		dp1[l][r][a]=max(dp1[l][k][a]+dp1[k][r][a], dp1[l][r][a]);
		dp2[l][r][a]=max(dp1[l][k][a]+dp2[k][r][a], dp2[l][r][a]);
	}
	dp3[l][r][a]=max(dp2[l][r][a], dp3[l][b[r][a^1]][a]);
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> k;
	for(int i=0; i<n; ++i) {
		cin >> ai;
		while(ai) {
			adj[i][ai-1]=1;
			cin >> ai;
		}
		b[i][0]=(i+n-1)%n;
		b[i][1]=(i+1)%n;
	}
	for(int l=1; l<n; ++l) {
		for(int i=0; i<n; ++i) {
			c(i, (i+l)%n, 1);
			c((i+l)%n, i, 0);
		}
	}
	for(int i=0; i<n; ++i)
		for(int j=0; j<n; ++j)
			for(int k=0; k<2; ++k)
				ans=max({{dp2[i][j][k], i}, ans});
	if(k) {
		for(int i=0; i<n; ++i) {
			for(int j=0; j<n; ++j) {
				for(int a=0; a<2; ++a) {
					if(dp1[i][j][a]<=0)
						continue;
					int k=b[j][a];
					for(; k!=i&&!adj[k][i]; k=b[k][a]);
					if(k!=i)
						for(int l=b[k][a]; l!=i; l=b[l][a])
							if(adj[j][l])
								ans=max({{2+dp1[i][j][a]+max(dp3[l][b[k][a]][a^1], dp3[l][b[i][a^1]][a]), k}, ans});
				}
			}
		}
	}
	cout << ans[0] << "\n" << ans[1]+1;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 512 KB Output is correct
2 Correct 1 ms 640 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 1024 KB Output is correct
6 Correct 3 ms 1152 KB Output is correct
7 Correct 3 ms 1280 KB Output is correct
8 Correct 5 ms 1280 KB Output is correct
9 Correct 4 ms 1408 KB Output is correct
10 Correct 6 ms 1536 KB Output is correct
11 Correct 6 ms 1536 KB Output is correct
12 Correct 73 ms 2936 KB Output is correct
13 Correct 200 ms 4096 KB Output is correct
14 Correct 247 ms 5332 KB Output is correct
15 Correct 1043 ms 6528 KB Output is correct
16 Correct 1123 ms 6648 KB Output is correct
17 Correct 1061 ms 6648 KB Output is correct
18 Correct 508 ms 6540 KB Output is correct
19 Correct 1284 ms 6668 KB Output is correct
20 Correct 1266 ms 6672 KB Output is correct