Submission #1130212

#TimeUsernameProblemLanguageResultExecution timeMemory
1130212enzyCommuter Pass (JOI18_commuter_pass)C++20
16 / 100
699 ms22280 KiB
#include <bits/stdc++.h> #define int long long using namespace std; const int maxn=1e5+10; const int inf=1e15+10; vector<pair<int,int>>adj[maxn]; int dist[maxn][4], n, marc[maxn]; //dist[i][?] 0-> dist a partir do u, 1-> dist a partir do v, 2-> dist a partir do s, 3-> dist a partir do t void dijkstra(int x, int t){ for(int i=1;i<=n;i++) dist[i][t]=inf; dist[x][t]=0; set<pair<int,int>>s; for(int i=1;i<=n;i++) s.insert({dist[i][t],i}); while(!s.empty()){ auto f=s.begin(); int u=f->second; s.erase(f); for(auto p : adj[u]){ int viz=p.first, w=p.second; if(dist[u][t]+w<dist[viz][t]){ s.erase({dist[viz][t],viz}); dist[viz][t]=dist[u][t]+w; s.insert({dist[viz][t],viz}); } } } } signed main() { ios_base::sync_with_stdio(false); cin.tie(NULL); int m, s, t, u, v; cin >> n >> m >> s >> t >> u >> v; for(int i=1;i<=m;i++){ int a, b, c; cin >> a >> b >> c; adj[a].push_back({b,c}); adj[b].push_back({a,c}); } dijkstra(u,0); int resp=dist[v][0]; dijkstra(v,1); dijkstra(s,2); dijkstra(t,3); int best=dist[t][2]; int dv=inf; for(int i=1;i<=n;i++){ if(dist[i][2]+dist[i][3]==best) dv=min(dv,dist[i][1]); } resp=min(resp,dv); cout << resp << endl; return 0; } // abc
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