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Submission #1083624

# Submission time Handle Problem Language Result Execution time Memory
1083624 2024-09-03T15:36:54 Z hahahaha Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 70 ms 3580 KB 
#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (auto i = (a); i < (b); ++i)
#define all(x) begin(x), end(x)

using ll = long long;

template<class T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }

const int N = 1 << 9, M = 1 << 16;
const ll inf = 1e18;

int n;
ll d[N][N], dist[N];
int a[M], b[M], w[M], c[M];
vector<int> g[N];
bool vis[N];

ll dij(int s, int t) {
	fill(dist, dist + n + 1, inf);
	fill(vis, vis + n, false);
	dist[s] = 0;
	rep(i, 0, n) {
		int u = n;
		rep(v, 0, n) if (!vis[v] && dist[v] < dist[u]) u = v;
		vis[u] = true;
		if (dist[u] == inf) break;
		for (int e : g[u]) ckmin(dist[b[e]], dist[u] + w[e]);
	}
	return dist[t];
}

signed main() {
	cin.tie(nullptr)->sync_with_stdio(false);

	int m; cin >> n >> m;
	rep(u, 0, n) rep(v, 0, n) d[u][v] = inf;
	rep(u, 0, n) d[u][u] = 0;
	rep(e, 0, m) {
		cin >> a[e] >> b[e] >> w[e] >> c[e], --a[e], --b[e];
		ckmin(d[a[e]][b[e]], ll(w[e]));
		g[a[e]].push_back(e);
	}

	rep(w, 0, n) rep(u, 0, n) rep(v, 0, n) ckmin(d[u][v], d[u][w] + d[w][v]);

	int s = 0, t = n - 1;
	ll ans = d[s][t] + d[t][s];
	rep(e, 0, m) {
		ll to = min(d[s][t], d[s][b[e]] + w[e] + d[a[e]][t]);
		ll fr = min(d[t][s], d[t][b[e]] + w[e] + d[a[e]][s]);
		if (c[e] + to + fr < ans) {
			g[a[e]].erase(find(all(g[a[e]]), e)); swap(a[e], b[e]); g[a[e]].push_back(e);
			ckmin(ans, c[e] + dij(s, t) + dij(t, s));
			g[a[e]].pop_back(); swap(a[e], b[e]); g[a[e]].push_back(e);
		}
	}

	cout << (ans < inf ? ans : -1);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1116 KB Output is correct
2 Correct 9 ms 1292 KB Output is correct
3 Correct 10 ms 1344 KB Output is correct
4 Correct 11 ms 1116 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 9 ms 1300 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 16 ms 1336 KB Output is correct
11 Correct 31 ms 1336 KB Output is correct
12 Correct 12 ms 1116 KB Output is correct
13 Correct 11 ms 1112 KB Output is correct
14 Correct 13 ms 1344 KB Output is correct
15 Correct 10 ms 1112 KB Output is correct
16 Correct 10 ms 1112 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 3420 KB Output is correct
2 Correct 23 ms 3164 KB Output is correct
3 Correct 24 ms 3416 KB Output is correct
4 Correct 11 ms 1368 KB Output is correct
5 Correct 10 ms 1332 KB Output is correct
6 Correct 9 ms 1160 KB Output is correct
7 Correct 9 ms 1116 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 27 ms 3416 KB Output is correct
10 Correct 24 ms 3420 KB Output is correct
11 Correct 22 ms 3420 KB Output is correct
12 Correct 23 ms 3416 KB Output is correct
13 Correct 28 ms 3420 KB Output is correct
14 Correct 22 ms 3416 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 1112 KB Output is correct
2 Correct 9 ms 1116 KB Output is correct
3 Correct 17 ms 2868 KB Output is correct
4 Correct 20 ms 1116 KB Output is correct
5 Correct 20 ms 3160 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 23 ms 3340 KB Output is correct
9 Correct 27 ms 3160 KB Output is correct
10 Correct 19 ms 3160 KB Output is correct
11 Correct 20 ms 3164 KB Output is correct
12 Correct 19 ms 3172 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 20 ms 3160 KB Output is correct
20 Correct 20 ms 3164 KB Output is correct
21 Correct 21 ms 3164 KB Output is correct
22 Correct 21 ms 3164 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1116 KB Output is correct
2 Correct 9 ms 1292 KB Output is correct
3 Correct 10 ms 1344 KB Output is correct
4 Correct 11 ms 1116 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 9 ms 1300 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 16 ms 1336 KB Output is correct
11 Correct 31 ms 1336 KB Output is correct
12 Correct 12 ms 1116 KB Output is correct
13 Correct 11 ms 1112 KB Output is correct
14 Correct 13 ms 1344 KB Output is correct
15 Correct 10 ms 1112 KB Output is correct
16 Correct 10 ms 1112 KB Output is correct
17 Correct 22 ms 3420 KB Output is correct
18 Correct 23 ms 3164 KB Output is correct
19 Correct 24 ms 3416 KB Output is correct
20 Correct 11 ms 1368 KB Output is correct
21 Correct 10 ms 1332 KB Output is correct
22 Correct 9 ms 1160 KB Output is correct
23 Correct 9 ms 1116 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 27 ms 3416 KB Output is correct
26 Correct 24 ms 3420 KB Output is correct
27 Correct 22 ms 3420 KB Output is correct
28 Correct 23 ms 3416 KB Output is correct
29 Correct 28 ms 3420 KB Output is correct
30 Correct 22 ms 3416 KB Output is correct
31 Correct 9 ms 1112 KB Output is correct
32 Correct 9 ms 1116 KB Output is correct
33 Correct 17 ms 2868 KB Output is correct
34 Correct 20 ms 1116 KB Output is correct
35 Correct 20 ms 3160 KB Output is correct
36 Correct 1 ms 344 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 23 ms 3340 KB Output is correct
39 Correct 27 ms 3160 KB Output is correct
40 Correct 19 ms 3160 KB Output is correct
41 Correct 20 ms 3164 KB Output is correct
42 Correct 19 ms 3172 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 0 ms 344 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 0 ms 344 KB Output is correct
49 Correct 20 ms 3160 KB Output is correct
50 Correct 20 ms 3164 KB Output is correct
51 Correct 21 ms 3164 KB Output is correct
52 Correct 21 ms 3164 KB Output is correct
53 Correct 26 ms 3420 KB Output is correct
54 Correct 23 ms 3280 KB Output is correct
55 Correct 26 ms 3164 KB Output is correct
56 Correct 10 ms 1116 KB Output is correct
57 Correct 10 ms 1336 KB Output is correct
58 Correct 20 ms 2908 KB Output is correct
59 Correct 22 ms 2900 KB Output is correct
60 Correct 21 ms 2904 KB Output is correct
61 Correct 22 ms 2956 KB Output is correct
62 Correct 41 ms 2908 KB Output is correct
63 Correct 70 ms 2904 KB Output is correct
64 Correct 27 ms 2904 KB Output is correct
65 Correct 43 ms 3020 KB Output is correct
66 Correct 67 ms 2908 KB Output is correct
67 Correct 10 ms 2140 KB Output is correct
68 Correct 24 ms 3580 KB Output is correct
69 Correct 25 ms 3420 KB Output is correct
70 Correct 24 ms 3420 KB Output is correct
71 Correct 24 ms 3416 KB Output is correct
72 Correct 22 ms 3392 KB Output is correct
73 Correct 23 ms 3420 KB Output is correct
74 Correct 23 ms 3420 KB Output is correct