Untitled
user_5379400
plain_text
23 days ago
1.9 kB
2
Indexable
Never
#include<bits/stdc++.h> using namespace std; const int N = 305; const int inf = 1e9; int n, m; map<int, pair<int, int>> ID; vector<bool> hasEdge[N]; vector<pair<int, int>> a[N]; int dist[N][15]; bool vis[N][15]; void init(){ cin >> n >> m; ID.clear(); for (int i = 0; i < n; i++) a[i].clear(), hasEdge[i].clear(); for (int i = 0; i < m; i++){ int id, u, v, w; cin >> id >> u >> v >> w; a[u].push_back({v, w}); hasEdge[u].push_back(1); int sz = hasEdge[u].size(); ID[id] = {u, sz - 1}; } } int dfs(int st, int ed, int M){ for (int i = 0; i < n; i++){ for (int j = 0; j <= M; j++){ dist[i][j] = inf; vis[i][j] = false; } } priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>> q; q.push({0, {st, 0}}); dist[st][0] = 0; int ans = inf; while(q.size()){ auto U = q.top(); q.pop(); int cost = U.first; int u = U.second.first; int cntVoucher = U.second.second; if (vis[u][cntVoucher]) continue; if (u == ed) ans = min(ans, inf); vis[u][cntVoucher] = true; int sz = hasEdge[u].size(); for (int i = 0; i < sz; i++){ if (!hasEdge[u][i]) continue; int v = a[u][i].first; int w = a[u][i].second; if (dist[u][cntVoucher] + w < dist[v][cntVoucher]){ dist[v][cntVoucher] = dist[u][cntVoucher] + w; q.push({dist[v][cntVoucher], {v, cntVoucher}}); } if (cntVoucher < M && dist[u][cntVoucher] + w / 2 < dist[v][cntVoucher + 1]){ dist[v][cntVoucher + 1] = dist[u][cntVoucher] + w / 2; q.push({dist[v][cntVoucher + 1], {v, cntVoucher + 1}}); } } } if (ans == inf) ans = -1; return ans; } void solve(){ } int32_t main() { ios_base::sync_with_stdio(false), cin.tie(0); int t; cin >> t; while(t--) solve(); }
Leave a Comment