Cod sursa(job #1995652)

Utilizator Horia14Horia Banciu Horia14 Data 28 iunie 2017 18:58:46
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 1.43 kb
#include<cstdio>
#include<queue>
#define MAX_N 50000
#define oo 2000000000
using namespace std;

struct nod
{
    int val, c;
    nod* next;
};

nod* L[MAX_N + 1];
bool used[MAX_N + 1];
int d[MAX_N + 1], n, m;
queue<int>Q;

inline void InsertNode(int x, int y, int c)
{
    nod* elem = new nod;
    elem->val = y;
    elem->c = c;
    elem->next = L[x];
    L[x] = elem;
}

int main()
{
    int i, x, y, z,  Nod;
    nod* p;
    FILE *fin, *fout;
    fin = fopen("dijkstra.in","r");
    fout = fopen("dijkstra.out","w");
    fscanf(fin,"%d%d",&n,&m);
    for(i=1; i<=m; i++)
    {
        fscanf(fin,"%d%d%d",&x,&y,&z);
        InsertNode(x,y,z);
    }
    fclose(fin);
    for(i=1; i<=n; i++)
        d[i] = oo;
    d[1] = 0;
    used[1] = true;
    Q.push(1);
    while(!Q.empty())
    {
        Nod = Q.front();
        Q.pop();
        used[Nod] = false;
        p = L[Nod];
        while(p != NULL)
        {
            if(d[p->val] > d[Nod] + p->c)
            {
                d[p->val] = d[Nod] + p->c;
                if(!used[p->val])
                {
                    Q.push(p->val);
                    used[p->val] = true;
                }
            }
            p = p->next;
        }
    }
    for(i=2; i<=n; i++)
        if(d[i] != oo)
            fprintf(fout,"%d ",d[i]);
        else fprintf(fout,"0 ");
    fprintf(fout,"\n");
    fclose(fout);
    return 0;
}