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Submission #938457

# Submission time Handle Problem Language Result Execution time Memory
938457 2024-03-05T07:02:41 Z Gromp15 From Hacks to Snitches (BOI21_watchmen) C++17
15 / 100
 6000 ms 68004 KB 
#include <bits/stdc++.h>
#define ll long long
#define ar array
#define db double
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define rint(l, r) uniform_int_distribution<int>(l, r)(rng)
template<typename T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<typename T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }
void test_case() {
	int n, m;
	cin >> n >> m;
	vector<vector<int>> adj(n+1);
	for (int i = 0; i < m; i++) {
		int x, y;
		cin >> x >> y;
		adj[x].push_back(y);
		adj[y].push_back(x);
	}
	vector<int> size(n+1, 1), who(n+1, -1), id(n+1, -1);
	int Q; cin >> Q;
	for (int i = 0; i < Q; i++) {
		int cur; cin >> cur;
		for (int j = 0; j < cur; j++) {
			int x; cin >> x;
			size[x] = cur;
			who[x] = j;
			id[x] = i;
		}
	}
	// if size[v]
	// then, dist[v] % size[v] != who[v]
	vector<vector<int>> dist(n+1);
	for (int i = 1; i <= n; i++) {
		dist[i].resize(size[i], 1e9);
	}
	// number of nodes = N + sum(L)
	const int N = 1501; // max edge length = 1500
	vector<vector<ar<int, 3>>> queues(N);
	queues[0].push_back({1, 0, 1});
	dist[1][0] = 0;
	int max_dist = 0;
	for (int cost = 0; cost <= max_dist; cost++) {
		int use = cost % N;
		while (queues[use].size()) {
			auto [v, time, len] = queues[use].back(); queues[use].pop_back();
			if (dist[v][time] == cost) {
				for (int u : adj[v]) {
					// cost + i - 1 = who[u] (mod size[u])
					// [cost, cost + i - 1] mod size[u] != who[u]
					int res;
					if (size[v] > 1) {
						if (cost % size[v] < who[v]) {
							res = who[v] - cost % size[v];
						}
						else {
							res = who[v] + (size[v] - cost % size[v]);
						}
					}
					else res = 1e9;
					ar<int, 2> avoid{int(1e9), int(1e9)};
					// (cost + i) % size[u] == who[u]
					avoid[0] = ~who[u] ? ((who[u] - cost) % size[u] + size[u]) % size[u] : 1e9;
					if (id[u] == id[v] && ((who[u] + 1) % size[u] == who[v]) && ~who[u]) {
						// (cost + i - 1) = who[u] (mod size[u])
						avoid[1] = ((who[u] + 1 - cost) % size[u] + size[u]) % size[u];
					}
					if (avoid[0] > avoid[1]) swap(avoid[0], avoid[1]);
					auto add = [&](int L, int R) {
						if (ckmin(dist[u][(cost+L)%size[u]], cost + L)) {
							queues[(cost + L) % N].push_back({u, (cost + L) % size[u], R-L+1});
							ckmax(max_dist, cost + R);
						}
					};
					int to = min(res, size[u]);
					if (avoid[0] == 1e9) {
						add(1, to);
					}
					else {
						if (1 < avoid[0]) {
							add(1, avoid[0] - 1);
						}
						if (avoid[1] > to) {
							if (avoid[0] + 1 <= to) add(avoid[0] + 1, to);
						}
						else {
							if (avoid[0] + 1 < avoid[1]) add(avoid[0] + 1, avoid[1] - 1);
							if (avoid[1] + 1 <= to) add(avoid[1] + 1, to);
						}
					}
					/*
					for (int i = 1; i <= to; i++) if (i != avoid[0] && i != avoid[1]) {
						if (ckmin(dist[u][(cost+i)%size[u]], cost + i)) {
							queues[(cost + i) % N].push_back({u, (cost + i) % size[u], 1});
							ckmax(max_dist, cost + i);
						}
					}
					*/
				}
			}
			if (len > 1) {
				if (ckmin(dist[v][(cost+1)%size[v]], cost + 1))
					queues[(cost + 1) % N].push_back({v, (cost + 1) % size[v], len - 1});
			}
		}
	}
	int ans = *min_element(all(dist[n]));
	if (ans == 1e9) {
		cout << "impossible\n";
		return;
	}
	cout << ans << '\n';



}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
//    cin >> t;
    while (t--) test_case();
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 1504 KB Output is correct
2 Correct 47 ms 12888 KB Output is correct
3 Correct 42 ms 11840 KB Output is correct
4 Correct 90 ms 12368 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 41 ms 12028 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 98 ms 1368 KB Output is correct
2 Correct 47 ms 12880 KB Output is correct
3 Correct 40 ms 11856 KB Output is correct
4 Correct 101 ms 12464 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 40 ms 11964 KB Output is correct
7 Correct 38 ms 11856 KB Output is correct
8 Correct 40 ms 11612 KB Output is correct
9 Correct 37 ms 11604 KB Output is correct
10 Correct 68 ms 11996 KB Output is correct
11 Correct 42 ms 11856 KB Output is correct
12 Correct 40 ms 11992 KB Output is correct

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 98 ms 1368 KB Output is correct
2 Correct 47 ms 12880 KB Output is correct
3 Correct 40 ms 11856 KB Output is correct
4 Correct 101 ms 12464 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 40 ms 11964 KB Output is correct
7 Correct 38 ms 11856 KB Output is correct
8 Correct 40 ms 11612 KB Output is correct
9 Correct 37 ms 11604 KB Output is correct
10 Correct 68 ms 11996 KB Output is correct
11 Correct 42 ms 11856 KB Output is correct
12 Correct 40 ms 11992 KB Output is correct
13 Correct 100 ms 1564 KB Output is correct
14 Correct 57 ms 12748 KB Output is correct
15 Correct 43 ms 11852 KB Output is correct
16 Correct 111 ms 12580 KB Output is correct
17 Correct 2 ms 604 KB Output is correct
18 Correct 41 ms 12036 KB Output is correct
19 Correct 42 ms 11860 KB Output is correct
20 Correct 46 ms 11604 KB Output is correct
21 Correct 39 ms 11600 KB Output is correct
22 Correct 54 ms 12100 KB Output is correct
23 Correct 43 ms 11856 KB Output is correct
24 Correct 41 ms 11820 KB Output is correct
25 Correct 1096 ms 63728 KB Output is correct
26 Correct 1049 ms 68004 KB Output is correct
27 Correct 935 ms 63432 KB Output is correct
28 Correct 847 ms 67200 KB Output is correct
29 Execution timed out 6012 ms 58572 KB Time limit exceeded
30 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 98 ms 1368 KB Output is correct
2 Correct 47 ms 12880 KB Output is correct
3 Correct 40 ms 11856 KB Output is correct
4 Correct 101 ms 12464 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 40 ms 11964 KB Output is correct
7 Correct 38 ms 11856 KB Output is correct
8 Correct 40 ms 11612 KB Output is correct
9 Correct 37 ms 11604 KB Output is correct
10 Correct 68 ms 11996 KB Output is correct
11 Correct 42 ms 11856 KB Output is correct
12 Correct 40 ms 11992 KB Output is correct
13 Correct 100 ms 1564 KB Output is correct
14 Correct 57 ms 12748 KB Output is correct
15 Correct 43 ms 11852 KB Output is correct
16 Correct 111 ms 12580 KB Output is correct
17 Correct 2 ms 604 KB Output is correct
18 Correct 41 ms 12036 KB Output is correct
19 Correct 42 ms 11860 KB Output is correct
20 Correct 46 ms 11604 KB Output is correct
21 Correct 39 ms 11600 KB Output is correct
22 Correct 54 ms 12100 KB Output is correct
23 Correct 43 ms 11856 KB Output is correct
24 Correct 41 ms 11820 KB Output is correct
25 Correct 1096 ms 63728 KB Output is correct
26 Correct 1049 ms 68004 KB Output is correct
27 Correct 935 ms 63432 KB Output is correct
28 Correct 847 ms 67200 KB Output is correct
29 Execution timed out 6012 ms 58572 KB Time limit exceeded
30 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 1504 KB Output is correct
2 Correct 47 ms 12888 KB Output is correct
3 Correct 42 ms 11840 KB Output is correct
4 Correct 90 ms 12368 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 41 ms 12028 KB Output is correct
7 Correct 98 ms 1368 KB Output is correct
8 Correct 47 ms 12880 KB Output is correct
9 Correct 40 ms 11856 KB Output is correct
10 Correct 101 ms 12464 KB Output is correct
11 Correct 1 ms 600 KB Output is correct
12 Correct 40 ms 11964 KB Output is correct
13 Correct 38 ms 11856 KB Output is correct
14 Correct 40 ms 11612 KB Output is correct
15 Correct 37 ms 11604 KB Output is correct
16 Correct 68 ms 11996 KB Output is correct
17 Correct 42 ms 11856 KB Output is correct
18 Correct 40 ms 11992 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 97 ms 1508 KB Output is correct
23 Correct 42 ms 12892 KB Output is correct
24 Correct 41 ms 11860 KB Output is correct
25 Correct 109 ms 12276 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 44 ms 12044 KB Output is correct
28 Correct 40 ms 11860 KB Output is correct
29 Correct 40 ms 11596 KB Output is correct
30 Correct 38 ms 11608 KB Output is correct
31 Correct 54 ms 12096 KB Output is correct
32 Correct 40 ms 11868 KB Output is correct
33 Correct 41 ms 11812 KB Output is correct
34 Correct 1147 ms 64668 KB Output is correct
35 Correct 1227 ms 60724 KB Output is correct
36 Correct 1302 ms 60472 KB Output is correct
37 Incorrect 988 ms 66460 KB Output isn't correct
38 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 1504 KB Output is correct
2 Correct 47 ms 12888 KB Output is correct
3 Correct 42 ms 11840 KB Output is correct
4 Correct 90 ms 12368 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 41 ms 12028 KB Output is correct
7 Correct 98 ms 1368 KB Output is correct
8 Correct 47 ms 12880 KB Output is correct
9 Correct 40 ms 11856 KB Output is correct
10 Correct 101 ms 12464 KB Output is correct
11 Correct 1 ms 600 KB Output is correct
12 Correct 40 ms 11964 KB Output is correct
13 Correct 38 ms 11856 KB Output is correct
14 Correct 40 ms 11612 KB Output is correct
15 Correct 37 ms 11604 KB Output is correct
16 Correct 68 ms 11996 KB Output is correct
17 Correct 42 ms 11856 KB Output is correct
18 Correct 40 ms 11992 KB Output is correct
19 Correct 100 ms 1564 KB Output is correct
20 Correct 57 ms 12748 KB Output is correct
21 Correct 43 ms 11852 KB Output is correct
22 Correct 111 ms 12580 KB Output is correct
23 Correct 2 ms 604 KB Output is correct
24 Correct 41 ms 12036 KB Output is correct
25 Correct 42 ms 11860 KB Output is correct
26 Correct 46 ms 11604 KB Output is correct
27 Correct 39 ms 11600 KB Output is correct
28 Correct 54 ms 12100 KB Output is correct
29 Correct 43 ms 11856 KB Output is correct
30 Correct 41 ms 11820 KB Output is correct
31 Correct 1096 ms 63728 KB Output is correct
32 Correct 1049 ms 68004 KB Output is correct
33 Correct 935 ms 63432 KB Output is correct
34 Correct 847 ms 67200 KB Output is correct
35 Execution timed out 6012 ms 58572 KB Time limit exceeded
36 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 1504 KB Output is correct
2 Correct 47 ms 12888 KB Output is correct
3 Correct 42 ms 11840 KB Output is correct
4 Correct 90 ms 12368 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 41 ms 12028 KB Output is correct
7 Correct 98 ms 1368 KB Output is correct
8 Correct 47 ms 12880 KB Output is correct
9 Correct 40 ms 11856 KB Output is correct
10 Correct 101 ms 12464 KB Output is correct
11 Correct 1 ms 600 KB Output is correct
12 Correct 40 ms 11964 KB Output is correct
13 Correct 38 ms 11856 KB Output is correct
14 Correct 40 ms 11612 KB Output is correct
15 Correct 37 ms 11604 KB Output is correct
16 Correct 68 ms 11996 KB Output is correct
17 Correct 42 ms 11856 KB Output is correct
18 Correct 40 ms 11992 KB Output is correct
19 Correct 100 ms 1564 KB Output is correct
20 Correct 57 ms 12748 KB Output is correct
21 Correct 43 ms 11852 KB Output is correct
22 Correct 111 ms 12580 KB Output is correct
23 Correct 2 ms 604 KB Output is correct
24 Correct 41 ms 12036 KB Output is correct
25 Correct 42 ms 11860 KB Output is correct
26 Correct 46 ms 11604 KB Output is correct
27 Correct 39 ms 11600 KB Output is correct
28 Correct 54 ms 12100 KB Output is correct
29 Correct 43 ms 11856 KB Output is correct
30 Correct 41 ms 11820 KB Output is correct
31 Correct 1096 ms 63728 KB Output is correct
32 Correct 1049 ms 68004 KB Output is correct
33 Correct 935 ms 63432 KB Output is correct
34 Correct 847 ms 67200 KB Output is correct
35 Execution timed out 6012 ms 58572 KB Time limit exceeded
36 Halted 0 ms 0 KB -