Cod sursa(job #3216245)

Utilizator aaagabiTurbinca Gabriel aaagabi Data 15 martie 2024 19:10:22
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.16 kb
#include <bits/stdc++.h>

using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
typedef pair<int,int> pii;
struct date
{
    int to,cost;
};
vector <date> vec[50005];
int n,m;
int x,y,c;
set <pair<int,int>> st;
int viz[50005],dmin[50005];
void dijkstra(int start)
{
    for(int i=1;i<=n;i++)
        dmin[i]=1e9;
    dmin[start]=0;
    st.insert({0,start});
    while(!st.empty())
    {
        pii prim=*st.begin();
        int cost=prim.first;
        int nod=prim.second;
        st.erase(st.begin());
        if(viz[nod])
            continue;
        viz[nod]=1;
        for(auto muc:vec[nod])
            if(dmin[muc.to]>cost+muc.cost)
        {
            if(dmin[muc.to]!=1e9)
                st.erase({dmin[muc.to],muc.to});
            dmin[muc.to]=cost+muc.cost;
            st.insert({dmin[muc.to],muc.to});
        }
    }
}
int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        vec[x].push_back({y,c});
    }
    dijkstra(1);
    for(int i=2;i<=n;i++)
        if(dmin[i]==1e9)
        fout<<"0 ";
    else
        fout<<dmin[i]<<' ';
    return 0;
}