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Cod sursa(job #2340693)

Utilizator radurotaruRotaru Radu Stefan radurotaru Data 10 februarie 2019 20:37:27
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.01 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
struct arc
{
    int x,y;
};
int n,d[100002],m,p,x,y,z;
bool a[100002];
vector <arc> v[100002];
queue <int> Q;

void dijkstra2(int q)
{
    for(int i=1; i<=n; i++)
        d[i]=999999999;
    d[q]=0;
    a[q]=1;
    Q.push(q);
    while(!Q.empty())
    {
        int w=Q.front();
        Q.pop();
        int e=v[w].size();
        for(int i=0; i<e; i++)
        {
            int r=v[w][i].x;
            int t=v[w][i].y;
            if(d[r]>d[w]+t)
            {
                d[r]=d[w]+t;
                a[r]=1;
                Q.push(r);
            }
        }
    }
}

int main()
{
    f>>n>>m;
    for(int i=1; i<=m; i++)
    {
        f>>x>>y>>z;
        v[x].push_back({y,z});
    }
    dijkstra2(1);
    for(int i=2; i<=n; i++)
    {
        if(a[i])
            g<<d[i]<<" ";
        else
            g<<0<<" ";
    }
    return 0;
}