Cod sursa(job #1142047)

Utilizator rzvrzvNicolescu Razvan rzvrzv Data 13 martie 2014 14:12:20
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.25 kb
#include<cstdio>
#include<vector>
#include<cstring>
#include<queue>

using namespace std;

vector<pair<int,int> >:: iterator it;
vector<pair<int,int> > grf[50002];
queue<int> q;
bool fol[50002];
int dmin[50002],i,m,n,a,b,c,crt;
int main()
{
    freopen("dijkstra.in","r",stdin);
    freopen("dijkstra.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=m;i++)
    {
        scanf("%d%d%d",&a,&b,&c);
        grf[a].push_back(make_pair(b,c));
    }
    memset(fol,false,sizeof(fol));
    memset(dmin,0x3f3f3f3f,sizeof(dmin));
    dmin[1]=0;
    fol[1]=true;
    q.push(1);
    while(q.size())
    {
        crt=q.front();
        q.pop();
        fol[crt]=false;
        for(it=grf[crt].begin();it!=grf[crt].end();it++)
        {
            if(dmin[crt]+it->second<dmin[it->first])
            {
                dmin[it->first]=dmin[crt]+it->second;
                if(!fol[it->first])
                {
                    q.push(it->first);
                    fol[it->first]=true;
                }
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        if(dmin[i]!=0x3f3f3f3f)
        {
            printf("%d ",dmin[i]);
        }
        else
        {
            printf("0 ");
        }
    }
}