Cod sursa(job #1881909)

Utilizator Horia14Horia Banciu Horia14 Data 16 februarie 2017 20:34:50
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.1 kb
#include<cstdio>
#include<queue>
#define N_MAX 100001
using namespace std;

int n, m, S;
int d[N_MAX];
queue<int>Q;

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

nod *L[N_MAX];

void BFS(int x)
{
    int i, Nod;
    nod *p;
    for(i=1; i<=n; i++)
        d[i] = -1;
    d[x] = 0;
    Q.push(x);
    while(!Q.empty())
    {
        Nod = Q.front();
        Q.pop();
        p = L[Nod];
        while(p != NULL)
        {
            if(d[p->val] == -1)
            {
                d[p->val] = 1 + d[Nod];
                Q.push(p->val);
            }
            p = p->next;
        }
    }
}

int main()
{
    int i, a, b;
    FILE *fin, *fout;
    fin = fopen("bfs.in","r");
    fout = fopen("bfs.out","w");
    fscanf(fin,"%d%d%d",&n,&m,&S);
    for(i=1; i<=m; i++)
    {
        fscanf(fin,"%d%d",&a,&b);
        nod *elem = new nod;
        elem->val = b;
        elem->next = L[a];
        L[a] = elem;
    }
    BFS(S);
    for(i=1; i<=n; i++)
        fprintf(fout,"%d ",d[i]);
    fprintf(fout,"\n");
    fclose(fout);
    fclose(fin);
    return 0;
}