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Cod sursa(job #1640190)

Utilizator george_stelianChichirim George george_stelian Data 8 martie 2016 16:18:32
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.82 kb
#include <cstdio>
#include <vector>
#include <queue>

using namespace std;

vector<int> v[100010];
queue<int> q;
int d[100010];
char vaz[100010];

int main()
{
    freopen("bfs.in", "r", stdin);
    freopen("bfs.out", "w", stdout);
    int n,m,s,x,y;
    scanf("%d%d%d",&n,&m,&s);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d",&x,&y);
        v[x].push_back(y);
    }
    for(int i=1;i<=n;i++) d[i]=-1;
    q.push(s);
    d[s]=0;vaz[s]=1;
    while(!q.empty())
    {
        int nod=q.front();q.pop();
        for(vector<int>::iterator it=v[nod].begin();it!=v[nod].end();it++)
            if(!vaz[*it])
            {
                vaz[*it]=1;
                d[*it]=d[nod]+1;
                q.push(*it);
            }
    }
    for(int i=1;i<=n;i++) printf("%d ",d[i]);
    return 0;
}