Submission #499162

#	Time	Username	Problem	Language	Result	Execution time	Memory
499162		Aktan	Evacuation plan (IZhO18_plan)	C++17	100 / 100	1066 ms	60484 KiB

plan

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define int long long
#define ft first
#define sc second
using namespace std;
const int mod=1e9+7,INF=1e17;

vector<pair<int,int>> v[100005];

int dist[100005],pr[100005],id[100005],vis[100005],ans[100005];
set<int> s[100005];
pair<int,int>p[100005];
bool cmp(int x,int y){
	return dist[x]>dist[y];	
}
int find(int x){
	if(pr[x]==x){
		return x;
	}
	return pr[x]=find(pr[x]);
}
void merge(int x,int y,int val){
	if((x=find(x))==(y=find(y)))
		return;
	if(s[x].size()<s[y].size())	
		swap(x,y);
	for(auto it : s[y]){
		if(s[x].count(it))
			ans[it]=val;
		else
			s[x].insert(it);
	}
	pr[y]=x;
}
main(){
   int n,m,a,b,c;
   cin >> n >> m;
   for(int i=0;i<m;i++){
   	cin >> a >> b >> c;
	   v[a].push_back({b,c});
	   v[b].push_back({a,c}); 
   }
   for(int i=1;i<=n;i++){
   	dist[i]=INF;
   }
   int k,x;
   cin >> k;
   queue<int> q;
   for(int i=0;i<k;i++){
   	cin >> x;
   	q.push(x);
   	dist[x]=0;
   }
   while(!q.empty()){
   	int to=q.front();
   	q.pop();
   	for(auto it : v[to]){
   		if(dist[it.ft]>dist[to]+it.sc){
   			dist[it.ft]=dist[to]+it.sc;
   			q.push(it.ft);
		   }
	   }
   }
   int t;
   cin >> t;
   for(int i=1;i<=t;i++){
   	int e,f;
   	cin >> e >> f;
   	s[e].insert(i);
   	s[f].insert(i);
   	p[i]=make_pair(e,f);
   }
   for(int i=1;i<=n;i++){
   	pr[i]=id[i]=i;
   }
   sort(id+1,id+n+1,cmp);
   for(int i=1;i<=n;i++){
   	vis[id[i]]=1;
   	for(auto it : v[id[i]]){
   		if(vis[it.ft]){
   			merge(it.ft,id[i],dist[id[i]]);
		   }
	   }
   }
   for(int i=1;i<=t;i++){
   	cout << ans[i] << endl;
   }
}

Compilation message (stderr)

plan.cpp:39:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   39 | main(){
      | ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 46 / 46