Cod sursa(job #1408922)

Utilizator gabib97Gabriel Boroghina gabib97 Data 30 martie 2015 12:27:11
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.11 kb
#include <stdio.h>
#include <vector>
#include <queue>
#define pp pair<int,int>
#define inf 100000000
using namespace std;
int n,m,x,y,c,s,i,d[50005],z;
vector< pp > G[50005];
priority_queue<pp ,vector<pp>, greater<pp> > Q;
int main()
{
    freopen ("dijkstra.in","r",stdin);
    freopen ("dijkstra.out","w",stdout);
    scanf("%i%i",&n,&m);
    s=1;
    for (i=1;i<=n;i++) d[i]=inf;
    Q.push(make_pair(0,s));
    for(i=1;i<=m;i++)
    {
        scanf("%i%i%i",&x,&y,&c);
        G[x].push_back(pp(y,c));
    }
    d[s] = 0;
    pp p;
    while(!Q.empty())
    {
        p = Q.top();
        Q.pop();
        x=p.second;
        if (d[x]!=p.first) continue;
        z = G[x].size();
        for(i=0;i<z;i++)
        {
            y = G[x][i].first;
            c = G[x][i].second;
            if(d[y] > d[x] + c)
            {
                d[y] = d[x] + c;
                Q.push(make_pair(d[y],y));
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        if (d[i]!=inf) printf("%i",d[i]);
        else printf("0");
        if (i<n) printf(" ");
    }
    return 0;
}