Submission #1130159

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130159		am_aadvik	Olympic Bus (JOI20_ho_t4)	C++20	0 / 100	322 ms	7420 KiB

ho_t4

#include <iostream>
#include<set>
#include<map>
#include<vector>
#define int long long
#define inf 1e15
using namespace std;

vector<vector<int>> g[205];
vector<int> path(int s, int n) {
	set<pair<int, int>> q;
	vector<int> dist(n + 1, inf);
	q.insert({ 0, s }), dist[s] = 0;
	while (q.size()) {
		pair<int, int> f = *q.begin();
		q.erase(q.begin());
		for (auto y : g[f.second]) {
			int i = y[0], x = y[1];
			if (dist[i] > (x + f.first)) {
				if (dist[i] != inf) q.erase({ dist[i], i });
				dist[i] = (x + f.first);
				q.insert({ dist[i], i });
			}
		}
	}
	return dist;
}

int32_t main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n, m; cin >> n >> m;
	vector<vector<int>> e;
	for (int i = 0; i < m; ++i) {
		int u, v, c, d; cin >> u >> v >> c >> d;
		g[u].push_back({ v, c, d });
		e.push_back({ u, v, c, d });
	}

	vector<vector<int>> d(n + 1, vector<int>(n + 1));
	for (int i = 1; i <= n; ++i)
		d[i] = path(i, n);

	int ans = d[1][n] + d[n][1];
	for (auto x : e) {
		int u = x[0], v = x[1];
		int c1 = min(d[1][n], d[1][v] + d[u][n] + x[2]);
		int c2 = min(d[n][1], d[n][v] + d[u][1] + x[2]);
		ans = min(ans, c1 + c2 + x[3]);
	}
	cout << ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 63