Cod sursa(job #1669188)

Utilizator delta_wolfAndrei Stoica delta_wolf Data 30 martie 2016 14:43:12
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <cstdio>
#include<vector>
#include<cstring>
using namespace std;
int l,i,n,m,st,x,y;
int g[100010],s[100010],cost[100010];
vector <int> a[100010];
void bfs(int nod)
{
    int i,j;
    memset(cost,-1,sizeof(cost));
    l=1;
    cost[nod]=0;

    s[l]=nod;

    for(i=1;i<=l;i++)

        for(j=0;j<g[s[i]];j++)

        if(cost[a[s[i]][j]]==-1)
        {
            l++;

            s[l]=a[s[i]][j];

            cost[s[l]]=cost[s[i]]+1;
        }


}
int main()
{
    freopen("bfs.in","r",stdin);
    freopen("bfs.out","w",stdout);
    scanf("%d%d%d",&n,&m,&st);
    for(i=1;i<=m;i++)
    {
        scanf("%d%d",&x,&y);
        a[x].push_back(y);
    }
    for(i=1;i<=n;i++)
        g[i]=a[i].size();
    bfs(st);
    for(i=1;i<=n;i++)
        printf("%d ",cost[i]);
    printf("\n");
    return 0;
}