Cod sursa(job #1834879)

Utilizator UrsuDanUrsu Dan UrsuDan Data 25 decembrie 2016 19:43:47
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 1.47 kb
#include <cstdio>
#include <vector>
#include <queue>
#include <cstring>
#define inf 20050

using namespace std;

struct edge
{
    int node,cost;
    const bool operator<(const edge &node2)const
    {
        return cost>node2.cost;
    }
};

vector< vector< pair<int,int> > >g(50050);
priority_queue<edge>pq;
int dist[50050];
bool viz[50050];

int main()
{
    freopen("dijkstra.in","r",stdin);
    freopen("dijkstra.out","w",stdout);
    int x1,y1,c,m,n,i,j;
    edge x,y;
    scanf("%d%d",&n,&m);
    for(i=1;i<=m;i++)
    {
        scanf("%d%d%d",&x1,&y1,&c);
        g[x1].push_back(make_pair(y1,c));
    }
    memset(dist,inf,sizeof(dist));
    dist[1]=0;
    x.cost=0;
    x.node=1;
    pq.push(x);
    i=0;
    while(!pq.empty() && i!=n)
    {
        x=pq.top();
        pq.pop();
        if(viz[x.node]==false)
        {
            i++;
            viz[x.node]=true;
            for(j=0;j<g[x.node].size();j++)
            {
                if(dist[x.node]+g[x.node][j].second<dist[g[x.node][j].first])
                {
                    dist[g[x.node][j].first]=dist[x.node]+g[x.node][j].second;
                    y.node=g[x.node][j].first;
                    y.cost=dist[g[x.node][j].first];
                    pq.push(y);
                }
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        if(dist[i]!=inf)
            printf("%d ",dist[i]);
        else
            printf("0 ");
    }
    return 0;
}