Cod sursa(job #2365178)

Utilizator baranceanuBaranceanu Vlad baranceanu Data 4 martie 2019 12:20:14
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 2.11 kb
#include <fstream>
#define NMAX 50005
#include <vector>
#include <queue>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
struct graf{int nod,val;};
int uz[NMAX];
int pre[NMAX];
int cmin[NMAX];
int h[NMAX];
int sol[NMAX];
vector <graf> g[NMAX];
struct cmp
{ bool operator()(int x, int y) {return cmin[x]>cmin[y];}
};
priority_queue  <int , vector< int >, cmp> q;
int n,p,s,f,m;
void citire();
void rezolvare(int x);
int main()
{
    citire();
    rezolvare(1);
    return 0;
}
void citire()
{
    int i,j;
    int a,b,c;
    fin>>n>>m;
    /*fin>>n>>s>>f;
    for(i=1;i<=n;i++)
    {
        fin>>h[i];
    }
    */
    graf k;
    for(i=1;i<=m;i++)
    {
        fin>>a>>b>>c;
        k.val=c;
        k.nod=b;
        g[a].push_back(k);

        /*for(j=1;j<=a;j++)
        {
            fin>>c;
            if(h[i]>h[c])
            {
                k.val=h[i]/h[c];
            }
            else
                k.val=h[c]/h[i];
            k.nod=c;
            g[i].push_back(k);
        }
        */
    }
}
void rezolvare(int x)
{
    int i,a,minim;
    uz[x]=1;
    for(i=1;i<=n;i++)
    {
        cmin[i]=5000000;
    }
    cmin[x]=0;
    q.push(x);
    while(!q.empty())
    {
        a=q.top();
        q.pop();
        uz[a]=1;
        for(i=0;i<g[a].size();i++)
        {
            if(cmin[g[a][i].nod]>cmin[a]+g[a][i].val)
            {cmin[g[a][i].nod]=cmin[a]+g[a][i].val;
            pre[g[a][i].nod]=a;
            if(uz[g[a][i].nod]==0)
            {
                uz[g[a][i].nod]=1;
                q.push(g[a][i].nod);

            }
            }
        }
    }
    /*if(p==1)
        fout<<cmin[f];
    else
    {
        i=0;
        sol[i]=f;
        while(pre[f]!=0)
        {
            f=pre[f];
            sol[++i]=f;
        }
        fout<<i+1<<'\n';
        for(;i>=0;i--)
        {
            fout<<sol[i]<<' ';
        }
    }
    */
    for(i=2;i<=n;i++)
        if(cmin[i]!=5000000)
        {fout<<cmin[i]<<' ';
        }
        else
            fout<<0<<' ';
}