Submission #395998

#	Time	Username	Problem	Language	Result	Execution time	Memory
395998		keta_tsimakuridze	Commuter Pass (JOI18_commuter_pass)	C++14	0 / 100	541 ms	23272 KiB

commuter_pass

#include<bits/stdc++.h>
#define f first
#define int long long
#define s second
#define pii pair<int,int>
using namespace std;
const int N=2e5+5,mod=1e9+7,Inf=1e15;
int t,dist[5][N],a[5],ans[N],n,m,Ans;
vector<pair<int,int> > ds,V[N];
priority_queue<pii,vector<pii>,greater<pii> >q;
string s;
void go(){
	for(int i=1;i<=n;i++){
		ans[i] = Inf;
	}
	ans[a[2]] = 0; 
	for(int i=0;i<ds.size();i++){
		int u = ds[i].s;
		for(int j=0;j<V[u].size();j++){ 
			if(dist[0][u]+V[u][j].s + dist[1][V[u][j].f] == dist[1][a[0]] )
			 ans[V[u][j].f]=min(ans[V[u][j].f],ans[u]);
			
			ans[V[u][j].f]=min(ans[V[u][j].f],ans[u]+V[u][j].s);
		}
	}
	Ans=min(Ans,ans[a[3]]);
}
 main(){
	// t=1;
	cin>>n>>m;
	cin>>a[0]>>a[1]>>a[2]>>a[3];
	for(int i=1;i<=m;i++){
		int u,v,w;
		cin>>u>>v>>w;
		V[u].push_back({v,w});
		V[v].push_back({u,w});
	}
	for(int i=0;i<4;i++){
		for(int j=1;j<=n;j++) dist[i][j] = Inf;
		dist[i][a[i]]=0; 
		q.push({0,a[i]});
		while(q.size()){
			int d=q.top().f;
			int u=q.top().s; if(i==2)ds.push_back({d,u});
			q.pop();
			if(dist[i][u]<d) continue;
			for(int j=0;j<V[u].size();j++){
				if(dist[i][V[u][j].f]>d+V[u][j].s) {
					dist[i][V[u][j].f]=d+V[u][j].s;
					q.push({dist[i][V[u][j].f],V[u][j].f});
				}
			}
		}
	} Ans=1e15; 
	go();
	swap(a[2],a[3]);
	go();
	cout<<Ans;
}

Compilation message (stderr)

commuter_pass.cpp: In function 'void go()':
commuter_pass.cpp:17:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for(int i=0;i<ds.size();i++){
      |              ~^~~~~~~~~~
commuter_pass.cpp:19:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |   for(int j=0;j<V[u].size();j++){
      |               ~^~~~~~~~~~~~
commuter_pass.cpp: At global scope:
commuter_pass.cpp:28:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   28 |  main(){
      |       ^
commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:47:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |    for(int j=0;j<V[u].size();j++){
      |                ~^~~~~~~~~~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45