Cod sursa(job #1605417)

Utilizator RobertMMinzat Robert RobertM Data 18 februarie 2016 23:36:53
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.2 kb
#include <fstream>
using namespace std;
ifstream f("dijsktra.in");
ofstream g("dijkstra.out");
#define N 20001
#define inf 999999
int c[N][N],d[50001],t[50001],s[50001],n,m;
void cit(){
    int i,j,x,y,z;
    f>>n>>m;
    for(i=1;i<=n;i++){
        for(j=1;j<=n;j++)
            c[i][j]=inf;
        c[i][i]=0;}
    for(i=1;i<=m;i++){
        f>>x>>y>>z;
        c[x][y]=z;}
}
int min(int &q){
    int i,Min=inf+1;
    for(i=1;i<=n;i++)
        if(!s[i] && Min>d[i]){
            Min=d[i];
            q=i;}
    }
void det_drumuri(){
    int i,j,ok,x,k;
    for(i=1;i<=n;i++){
        d[i]=c[1][i];
        s[i]=0;
        if(c[1][i]<inf)
            t[i]=1;
        else t[i]=0;}
    t[1]=0;s[1]=1;ok=1;x=0;
    do{ min(k);
        x++;
        if(d[k]==inf || x==n)
            ok=0;
        else{
            s[k]=1;
            for(j=1;j<=n;j++)
                if(!s[j] && d[j]>d[k]+c[k][j]){
                    d[j]=d[k]+c[k][j];
                    t[j]=k;}
        }
    } while(ok);
}
void drum(int i){
    if(i){
        drum(t[i]);
        g<<i<<" ";}
}
int main()
{
    cit();
    det_drumuri();
    for(int i=2;i<=n;i++)
        g<<d[i]<<" ";
    return 0;
}