Cod sursa(job #3150411)

Utilizator Theo20067Cismaru Theodor-Alexe Theo20067 Data 16 septembrie 2023 14:03:58
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1 kb
#include <fstream>
#include <vector>
#include <set>
#define INF 2000000000
using namespace std;
ifstream fin ("dijkstra.in");
ofstream fout("dijkstra.out");
int n,i,j,m,x,y,t,p,vecin,cost,D[50001];
vector< pair<int,int> > L[50001];
set< pair<int,int> > S;
int main()
{
    fin>>n>>m;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y>>t;
        L[x].push_back({y,t});
    }
    for(i=1;i<=n;i++)
        D[i]=INF;

    D[1]=0;
    S.insert({0,1});
    while(!S.empty())
    {
        p=S.begin()->second;
        S.erase(S.begin());
        for(j=0;j<L[p].size();j++)
        {
            vecin=L[p][j].first;
            cost=L[p][j].second;
            if(D[vecin]>D[p]+cost)
            {
                S.erase({D[vecin],vecin});
                D[vecin]=D[p]+cost;
                S.insert({D[vecin],vecin});
            }
        }
    }
    for(i=2;i<=n;i++)
        if(D[i]==INF)
            fout<<0<<" ";
        else
            fout<<D[i]<<" ";

    return 0;
}