Submission #420012

#TimeUsernameProblemLanguageResultExecution timeMemory
420012Runtime_error_Evacuation plan (IZhO18_plan)C++14
100 / 100
713 ms39804 KiB
#include <bits/stdc++.h> #define pi pair<int,int> #define pb push_back #define all(v) v.begin(),v.end() #define rall(v) v.rbegin(),v.rend() using namespace std; const int inf = 1e5+9,MX = 1e9+9; int n,m,k,q,dis[inf],par[inf],qu[inf],qv[inf],qans[inf]; bool vis[inf]; vector<pi> adj[inf],distances; set<pair<int,int> > s; vector<int> queries[inf]; int root(int u){ if(u == par[u])return u; return par[u] = root(par[u]); } void join(int u,int v,int Time){ u = root(u), v = root(v); if(u == v)return ; if(queries[u].size() > queries[v].size()) swap(u,v); par[u] = v; for(auto id:queries[u]){ if(qans[id] != -1)continue; if(root(qu[id]) == root(qv[id])) qans[id] = Time; else queries[v].pb(id); } } int main(){ scanf("%d%d",&n,&m); for(int i=1;i<=m;i++){ int u,v,w; scanf("%d%d%d",&u,&v,&w); adj[u].pb(pi(v,w)); adj[v].pb(pi(u,w)); } for(int i=1;i<=n;i++) dis[i] = MX,par[i] = i; scanf("%d",&k); for(int i=1;i<=k;i++){ int u; scanf("%d",&u); s.insert(pi(0,u)); dis[u] = 0; } scanf("%d",&q); for(int i=1;i<=q;i++){ int u,v; scanf("%d%d",&u,&v); qu[i] = u,qv[i] = v; queries[u].pb(i); queries[v].pb(i); qans[i] = -1; } while(!s.empty()){ int u = s.begin()->second; s.erase(s.begin()); if(vis[u])continue; distances.pb(pi(dis[u],u)); vis[u] = 1; for(auto o:adj[u]){ int v = o.first,w = o.second; if(dis[v] > dis[u] + w) dis[v] = dis[u] + w,s.insert(pi(dis[v],v)); } } sort(rall(distances)); for(auto o:distances){ int Time = o.first,u = o.second; for(auto v:adj[u]) if(dis[v.first] >= dis[u]) join(u,v.first,Time); } for(int i=1;i<=q;i++) printf("%d\n",qans[i]); } /* 9 12 1 9 4 1 2 5 2 3 7 2 4 3 4 3 6 3 6 4 8 7 10 6 7 5 5 8 1 9 5 7 5 4 12 6 8 2 2 4 7 5 1 6 5 3 4 8 5 8 1 5 */

Compilation message (stderr)

plan.cpp: In function 'int main()':
plan.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
plan.cpp:39:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         scanf("%d%d%d",&u,&v,&w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~
plan.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     scanf("%d",&k);
      |     ~~~~~^~~~~~~~~
plan.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         scanf("%d",&u);
      |         ~~~~~^~~~~~~~~
plan.cpp:52:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |     scanf("%d",&q);
      |     ~~~~~^~~~~~~~~
plan.cpp:55:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         scanf("%d%d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...