#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF LLONG_MAX
#define endl '\n'
const int mod = 1000 * 1000 * 1000 + 7;
const int N = 205;
#define f first
#define s second
#define rep(i, a, b) for(int i = (a); i < (b); i++)
#define rrep(i, a, b) for(int i = (a); i > (b); i--)
#define vi vector<int>
#define pii pair<int, int>
#define all(x) (x).begin(), (x).end()
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
struct node {
int u, v, c, d;
};
multiset<pair<int, int>> graph[N];
vector<int> dijkstra(int src) {
vector<int> dist(N, INF);
vector<int> vis(N, false);
dist[src] = 0;
priority_queue<pii, vector<pii>, greater<pii>> pq;
pq.push({0, src});
while (!pq.empty()) {
auto uu = pq.top();
pq.pop();
int u = uu.second;
if (vis[u]) continue;
vis[u] = true;
for (auto& vv : graph[u]) {
int v = vv.first;
int weight = vv.second;
if (dist[v] > dist[u] + weight) {
dist[v] = dist[u] + weight;
pq.push({dist[v], v});
}
}
}
return dist;
}
void solve() {
int n, m;
cin >> n >> m;
vector<node> edges(m);
for (int i = 0; i < m; ++i) {
cin >> edges[i].u >> edges[i].v >> edges[i].c >> edges[i].d;
graph[edges[i].u].insert({edges[i].v, edges[i].c});
}
vector<vector<int>> dist(n + 1, vector<int>(n + 1, INF));
for (auto& e : edges) {
dist[e.u][e.v] = min(dist[e.u][e.v], e.c);
}
for (int k = 1; k <= n; ++k) {
for (int i = 1; i <= n; ++i) {
for (int j = 1; j <= n; ++j) {
dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
}
}
}
int ans = INF;
for (auto& e : edges) {
int temp1 = min(dist[1][e.v] + dist[e.u][n] + e.c, dist[1][n]);
int temp2 = min(dist[n][e.u] + dist[e.v][1] + e.c, dist[n][1]);
if (temp1 + temp2 + e.d < ans) {
graph[e.u].erase(graph[e.u].find({e.v, e.c}));
graph[e.v].insert({e.u, e.c});
auto dis1 = dijkstra(1);
auto dis2 = dijkstra(n);
ans = min(ans, dis1[n] + dis2[1] + e.d);
graph[e.v].erase(graph[e.v].find({e.u, e.c}));
graph[e.u].insert({e.v, e.c});
}
}
if (ans >= INF) cout << -1 << endl;
else cout << ans << endl;
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int t = 1;
// cin >> t;
for (int i = 1; i <= t; i++) {
// cout << "Case #" << i << ": ";
solve();
}
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
7 ms |
732 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
30 ms |
6492 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
9 ms |
856 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
7 ms |
732 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |