Submission #1098600
Source Code Expand
#include <bits/stdc++.h>
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define all(c) begin(c), end(c)
#define dump(x) cerr << __LINE__ << ":\t" #x " = " << (x) << endl
using Weight = int;
using Capacity = int;
struct Edge {
int src, dst;
Weight weight;
Edge() : src(0), dst(0), weight(0) {}
Edge(int s, int d, Weight w) : src(s), dst(d), weight(w) {}
};
using Edges = std::vector<Edge>;
using Graph = std::vector<Edges>;
using Array = std::vector<Weight>;
using Matrix = std::vector<Array>;
void add_edge(Graph &g, int a, int b, Weight w = 1) {
g[a].emplace_back(a, b, w);
g[b].emplace_back(b, a, w);
}
void add_arc(Graph &g, int a, int b, Weight w = 1) {
g[a].emplace_back(a, b, w);
}
Weight bidirectional_dijkstra(const Graph &g, int s, int t){
if(s == t) return 0;
constexpr Weight INF = std::numeric_limits<Weight>::max() / 2;
int n = g.size();
std::vector<Weight> dist[2];
dist[0] = dist[1] = std::vector<Weight>(n, INF);
dist[0][s] = dist[1][t] = 0;
using state = std::pair<Weight, int>;
std::priority_queue<state, std::vector<state>, std::greater<state>> q[2];
q[0].emplace(0, s);
q[1].emplace(0, t);
Weight mu = INF;
while (q[0].size() && q[1].size()) {
if (q[0].top().first + q[1].top().first >= mu) break;
int k = q[0].top().first <= q[1].top().first ? 0 : 1;
Weight d;
int v;
std::tie(d, v) = q[k].top();
q[k].pop();
if (d < dist[k][v]) continue;
for (auto &e: g[v]) {
int w = e.dst;
if (dist[k][w] > dist[k][v] + e.weight) {
dist[k][w] = dist[k][v] + e.weight;
q[k].emplace(dist[k][w], w);
mu = std::min(mu, dist[k][v] + e.weight + dist[1 - k][w]);
}
}
}
return mu;
}
using namespace std;
int main(){
cin.tie(0);
ios::sync_with_stdio(0);
int n, m;
cin >> n >> m;
Graph g(n);
rep(i, m){
int a, b, t;
cin >> a >> b >> t;
--a; --b;
add_edge(g, a, b, t);
}
int res = 1e9;
rep(i, n){
int cand = 0;
rep(j, n){
cand = max(cand, bidirectional_dijkstra(g, i, j));
if(cand > res) break;
}
res = min(res, cand);
}
cout << res << endl;
}
Submission Info
Submission Time |
|
Task |
D - バスと避けられない運命 |
User |
tubo28 |
Language |
C++11 (GCC 4.8.1) |
Score |
100 |
Code Size |
2429 Byte |
Status |
AC |
Exec Time |
904 ms |
Memory |
2908 KB |
Judge Result
Set Name |
All |
Score / Max Score |
100 / 100 |
Status |
|
Set Name |
Test Cases |
All |
test_01.txt, test_02.txt, test_03.txt, test_04.txt, test_05.txt, test_06.txt, test_07.txt, test_08.txt, test_09.txt, test_10.txt, test_11.txt, test_12.txt, test_13.txt, test_14.txt, test_15.txt, test_16.txt, test_17.txt, test_18.txt, test_19.txt, test_20.txt, test_21.txt, test_22.txt, test_23.txt, test_24.txt, test_25.txt, test_26.txt, test_27.txt, test_28.txt, test_29.txt, test_30.txt, test_31.txt, test_32.txt, test_33.txt, test_34.txt, test_35.txt, test_36.txt |
Case Name |
Status |
Exec Time |
Memory |
sample_01.txt |
AC |
20 ms |
924 KB |
sample_02.txt |
AC |
18 ms |
924 KB |
sample_03.txt |
AC |
17 ms |
920 KB |
test_01.txt |
AC |
19 ms |
924 KB |
test_02.txt |
AC |
34 ms |
924 KB |
test_03.txt |
AC |
441 ms |
2908 KB |
test_04.txt |
AC |
111 ms |
920 KB |
test_05.txt |
AC |
904 ms |
1564 KB |
test_06.txt |
AC |
48 ms |
1048 KB |
test_07.txt |
AC |
515 ms |
2660 KB |
test_08.txt |
AC |
20 ms |
924 KB |
test_09.txt |
AC |
204 ms |
1432 KB |
test_10.txt |
AC |
29 ms |
1052 KB |
test_11.txt |
AC |
45 ms |
1044 KB |
test_12.txt |
AC |
222 ms |
1048 KB |
test_13.txt |
AC |
44 ms |
1048 KB |
test_14.txt |
AC |
81 ms |
1052 KB |
test_15.txt |
AC |
714 ms |
2544 KB |
test_16.txt |
AC |
62 ms |
1052 KB |
test_17.txt |
AC |
134 ms |
1432 KB |
test_18.txt |
AC |
172 ms |
1052 KB |
test_19.txt |
AC |
81 ms |
1052 KB |
test_20.txt |
AC |
56 ms |
1052 KB |
test_21.txt |
AC |
19 ms |
924 KB |
test_22.txt |
AC |
91 ms |
1048 KB |
test_23.txt |
AC |
20 ms |
920 KB |
test_24.txt |
AC |
45 ms |
924 KB |
test_25.txt |
AC |
211 ms |
916 KB |
test_26.txt |
AC |
27 ms |
924 KB |
test_27.txt |
AC |
73 ms |
920 KB |
test_28.txt |
AC |
33 ms |
920 KB |
test_29.txt |
AC |
201 ms |
920 KB |
test_30.txt |
AC |
22 ms |
924 KB |
test_31.txt |
AC |
19 ms |
924 KB |
test_32.txt |
AC |
47 ms |
836 KB |
test_33.txt |
AC |
187 ms |
920 KB |
test_34.txt |
AC |
18 ms |
920 KB |
test_35.txt |
AC |
50 ms |
924 KB |
test_36.txt |
AC |
37 ms |
920 KB |