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Submission #863737

# Submission time Handle Problem Language Result Execution time Memory
863737 2023-10-20T19:15:39 Z TAhmed33 From Hacks to Snitches (BOI21_watchmen) C++
0 / 100
 2085 ms 105980 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
int dist[100001][126];
int arr[126];
int n;
vector <int> adj[100001];
signed main () {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int m;
	cin >> n >> m;
	for (int i = 1; i <= m; i++) {
		int a, b;
		cin >> a >> b;
		adj[a].push_back(b);
		adj[b].push_back(a);
	}
	int l; cin >> l >> l;
	for (int i = 0; i < l; i++) cin >> arr[i];
	for (int i = 0; i <= 125; i++) {
		for (int j = 1; j <= n; j++) {
			dist[j][i] = 1e9;
		}
	}
	dist[1][0] = 0;
	priority_queue <vector <int>, vector <vector <int>>, greater <vector <int>>> pq;
	pq.push({0, 0, 1});
	while (!pq.empty()) {
		auto k = pq.top();
		pq.pop();
		if (k[0] > dist[k[2]][k[1]]) continue;
		if (arr[(k[1] + 1) % l] != k[2]) {
			if (dist[k[2]][(k[1] + 1) % l] > k[0] + 1) {
				dist[k[2]][(k[1] + 1) % l] = k[0] + 1;
				pq.push({k[0] + 1, (k[1] + 1) % l, k[2]});
			}
		}
		for (auto j : adj[k[2]]) {
			if (j == arr[(k[1] + 1) % l]) continue;
			if (dist[j][(k[1] + 1) % l] > k[0] + 1) {
				dist[j][(k[1] + 1) % l] = k[0] + 1;
				pq.push({dist[j][(k[1] + 1) % l], (k[1] + 1) % l, j});
			}
		}
	}
	int mn = 1e9;
	for (int i = 0; i <= l; i++) {
		mn = min(mn, dist[n][i]);
	}
	if (mn >= 1e9) cout << "impossible\n";
	else cout << mn << '\n';
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7176 KB Output is correct
2 Incorrect 2085 ms 105728 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7172 KB Output is correct
2 Incorrect 2061 ms 105980 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7172 KB Output is correct
2 Incorrect 2061 ms 105980 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7172 KB Output is correct
2 Incorrect 2061 ms 105980 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7176 KB Output is correct
2 Incorrect 2085 ms 105728 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7176 KB Output is correct
2 Incorrect 2085 ms 105728 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 7176 KB Output is correct
2 Incorrect 2085 ms 105728 KB Output isn't correct
3 Halted 0 ms 0 KB -