Cod sursa(job #1849946)

Utilizator OlivianOlivian Dan Cretu Olivian Data 17 ianuarie 2017 23:16:02
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.11 kb
#include <cstdio>
#include <queue>
using namespace std;
const int inf=1000000000;
struct edge
{
    int nod,c;
    bool operator <(const edge &aux) const
    {
        return c>aux.c;
    }
};
vector<edge> v[50010];
priority_queue<edge> h;
int d[50010],n;
void dijkstra(int nod)
{
    for(int i=1; i<=n; i++) d[i]=inf;
    d[nod]=0;
    h.push({nod,0});
    while(!h.empty())
    {
        int nod=h.top().nod,c=h.top().c;
        h.pop();
        if(c>d[nod]) continue;
        for(vector<edge>::iterator it=v[nod].begin(); it!=v[nod].end(); it++)
            if(d[nod]+it->c<d[it->nod])
            {
                d[it->nod]=d[nod]+it->c;
                h.push({it->nod,d[it->nod]});
            }
    }
}
int main()
{
    freopen("dijkstra.in", "r", stdin);
    freopen("dijkstra.out", "w", stdout);
    int m,x,y,c;
    scanf("%d%d",&n,&m);
    for(int i=1; i<=m; i++)
    {
        scanf("%d%d%d",&x,&y,&c);
        v[x].push_back({y,c});
    }
    dijkstra(1);
    for(int i=2; i<=n; i++)
        if(d[i]==inf) printf("0 ");
        else printf("%d ",d[i]);
    return 0;
}