Cod sursa(job #2964961)

Utilizator aaagabiTurbinca Gabriel aaagabi Data 14 ianuarie 2023 10:46:51
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.27 kb
#include <bits/stdc++.h>

using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
vector <pair<int,int>> v[50005];
int uz[50005],dmin[50005];
typedef long long ll;
int n,m,x,y,c;
set <pair<int,int>> s;
void dijkstra(int start)
{
    for(int i=0;i<=n;i++)
        dmin[i]=1e9;
    dmin[1]=0;
    s.insert(make_pair(0,1));
    while(!s.empty())
    {
        pair <int,int> prim;
        prim.first=s.begin()->first;
        prim.second=s.begin()->second;
        s.erase(s.begin());
        for(int i=0;i<v[prim.second].size();i++)
        {
            int to=v[prim.second][i].first;
            int cost=v[prim.second][i].second;
            if(dmin[to]>dmin[prim.second]+cost)
            {
                if(dmin[to]!=1e9)
                {
                    s.erase(s.find(make_pair(dmin[to],to)));
                }
                dmin[to]=dmin[prim.second]+cost;
                s.insert(make_pair(dmin[to],to));
            }
        }
    }
}
int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        v[x].push_back(make_pair(y,c));
    }
    dijkstra(1);
    for(int i=2;i<=n;i++)
        if(dmin[i]==1e9)
        fout<<"0 ";
    else
        fout<<dmin[i]<<' ';
    return 0;
}