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Submission #276660

# Submission time Handle Problem Language Result Execution time Memory
276660 2020-08-20T14:47:35 Z islingr Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 113 ms 2432 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 15 ms 1152 KB Output is correct
2 Correct 13 ms 1152 KB Output is correct
3 Correct 18 ms 1152 KB Output is correct
4 Correct 12 ms 1152 KB Output is correct
5 Correct 2 ms 512 KB Output is correct
6 Correct 10 ms 1152 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 32 ms 1152 KB Output is correct
11 Correct 66 ms 1152 KB Output is correct
12 Correct 14 ms 1152 KB Output is correct
13 Correct 12 ms 1152 KB Output is correct
14 Correct 13 ms 1152 KB Output is correct
15 Correct 11 ms 1152 KB Output is correct
16 Correct 11 ms 1152 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 2304 KB Output is correct
2 Correct 39 ms 2304 KB Output is correct
3 Correct 34 ms 2304 KB Output is correct
4 Correct 14 ms 1280 KB Output is correct
5 Correct 16 ms 1152 KB Output is correct
6 Correct 10 ms 1252 KB Output is correct
7 Correct 10 ms 1152 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 38 ms 2296 KB Output is correct
10 Correct 35 ms 2304 KB Output is correct
11 Correct 34 ms 2304 KB Output is correct
12 Correct 34 ms 2280 KB Output is correct
13 Correct 33 ms 2304 KB Output is correct
14 Correct 32 ms 2304 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 1152 KB Output is correct
2 Correct 10 ms 1152 KB Output is correct
3 Correct 24 ms 2048 KB Output is correct
4 Correct 10 ms 1152 KB Output is correct
5 Correct 29 ms 2304 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 33 ms 2236 KB Output is correct
9 Correct 34 ms 2304 KB Output is correct
10 Correct 28 ms 2432 KB Output is correct
11 Correct 33 ms 2304 KB Output is correct
12 Correct 30 ms 2296 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 0 ms 384 KB Output is correct
16 Correct 0 ms 384 KB Output is correct
17 Correct 0 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 30 ms 2304 KB Output is correct
20 Correct 29 ms 2304 KB Output is correct
21 Correct 28 ms 2296 KB Output is correct
22 Correct 28 ms 2304 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 1152 KB Output is correct
2 Correct 13 ms 1152 KB Output is correct
3 Correct 18 ms 1152 KB Output is correct
4 Correct 12 ms 1152 KB Output is correct
5 Correct 2 ms 512 KB Output is correct
6 Correct 10 ms 1152 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 32 ms 1152 KB Output is correct
11 Correct 66 ms 1152 KB Output is correct
12 Correct 14 ms 1152 KB Output is correct
13 Correct 12 ms 1152 KB Output is correct
14 Correct 13 ms 1152 KB Output is correct
15 Correct 11 ms 1152 KB Output is correct
16 Correct 11 ms 1152 KB Output is correct
17 Correct 33 ms 2304 KB Output is correct
18 Correct 39 ms 2304 KB Output is correct
19 Correct 34 ms 2304 KB Output is correct
20 Correct 14 ms 1280 KB Output is correct
21 Correct 16 ms 1152 KB Output is correct
22 Correct 10 ms 1252 KB Output is correct
23 Correct 10 ms 1152 KB Output is correct
24 Correct 0 ms 384 KB Output is correct
25 Correct 38 ms 2296 KB Output is correct
26 Correct 35 ms 2304 KB Output is correct
27 Correct 34 ms 2304 KB Output is correct
28 Correct 34 ms 2280 KB Output is correct
29 Correct 33 ms 2304 KB Output is correct
30 Correct 32 ms 2304 KB Output is correct
31 Correct 16 ms 1152 KB Output is correct
32 Correct 10 ms 1152 KB Output is correct
33 Correct 24 ms 2048 KB Output is correct
34 Correct 10 ms 1152 KB Output is correct
35 Correct 29 ms 2304 KB Output is correct
36 Correct 0 ms 384 KB Output is correct
37 Correct 1 ms 384 KB Output is correct
38 Correct 33 ms 2236 KB Output is correct
39 Correct 34 ms 2304 KB Output is correct
40 Correct 28 ms 2432 KB Output is correct
41 Correct 33 ms 2304 KB Output is correct
42 Correct 30 ms 2296 KB Output is correct
43 Correct 1 ms 384 KB Output is correct
44 Correct 0 ms 384 KB Output is correct
45 Correct 0 ms 384 KB Output is correct
46 Correct 0 ms 384 KB Output is correct
47 Correct 0 ms 384 KB Output is correct
48 Correct 0 ms 384 KB Output is correct
49 Correct 30 ms 2304 KB Output is correct
50 Correct 29 ms 2304 KB Output is correct
51 Correct 28 ms 2296 KB Output is correct
52 Correct 28 ms 2304 KB Output is correct
53 Correct 32 ms 2304 KB Output is correct
54 Correct 35 ms 2300 KB Output is correct
55 Correct 34 ms 2296 KB Output is correct
56 Correct 12 ms 1152 KB Output is correct
57 Correct 12 ms 1152 KB Output is correct
58 Correct 32 ms 2048 KB Output is correct
59 Correct 30 ms 2048 KB Output is correct
60 Correct 31 ms 2048 KB Output is correct
61 Correct 30 ms 2048 KB Output is correct
62 Correct 63 ms 2048 KB Output is correct
63 Correct 113 ms 2172 KB Output is correct
64 Correct 40 ms 2048 KB Output is correct
65 Correct 66 ms 2048 KB Output is correct
66 Correct 110 ms 2168 KB Output is correct
67 Correct 17 ms 1280 KB Output is correct
68 Correct 46 ms 2296 KB Output is correct
69 Correct 36 ms 2304 KB Output is correct
70 Correct 35 ms 2304 KB Output is correct
71 Correct 33 ms 2300 KB Output is correct
72 Correct 38 ms 2296 KB Output is correct
73 Correct 42 ms 2296 KB Output is correct
74 Correct 33 ms 2304 KB Output is correct