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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define sz 100100
  4. #define MOD 1000000007
  5. #define ll long long
  6. vector<pair<int, int>>adj[sz];
  7. int minedges[sz];
  8. int maxedges[sz];
  9. ll dist[sz];
  10. int main()
  11. {
  12. 	ios::sync_with_stdio(0);
  13. 	cin.tie(0); cout.tie(0);
  14. 	int n, m; cin >> n >> m;
  15. 	while (m--)
  16. 	{
  17. 		int a, b, c; cin >> a >> b >> c;
  18. 		adj[a].push_back({b, c});
  19. 	}
  20. 	priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>>pq;
  21. 	for (ll i = 1; i <= n; i++)
  22. 		dist[i] = 1e16;
  23. 	minedges[1] = maxedges[1] = 0;
  24. 	pq.push({0, 1});
  25. 	ll cnt = 0;
  26. 	while (!pq.empty())
  27. 	{
  28. 		pair<ll, int>cur = pq.top();
  29. 		pq.pop();
  30. 		if (cur.first > dist[cur.second])
  31. 			continue;
  32. 		for (auto it : adj[cur.second])
  33. 		{
  34. 			if (it.second + cur.first == dist[it.first])
  35. 			{
  36. 				minedges[it.first] = min(minedges[it.first], minedges[cur.second] + 1);
  37. 				maxedges[it.first] = max(maxedges[it.first], maxedges[cur.second] + 1);
  38. 				pq.push({cur.first + it.second, it.first});
  39. 				if (it.first == n)
  40. 					cnt = cnt + 1;
  41. 			}
  42. 			else if (it.second + cur.first < dist[it.first])
  43. 			{
  44. 				minedges[it.first] = minedges[cur.second] + 1;
  45. 				maxedges[it.first] = maxedges[cur.second] + 1;
  46. 				dist[it.first] = it.second + cur.first;
  47. 				pq.push({cur.first + it.second, it.first});
  48. 				if (it.first == n)
  49. 					cnt = 1;
  50. 			}
  51. 		}
  52. 	}
  53. 	cout << dist[n] << " " << cnt << " " << minedges[n] << " " << maxedges[n];
  54. 	return 0;
  55. }
Success #stdin #stdout 0s 5924KB
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4 5
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https://ideone.com/e6ZTWL
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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