Cod sursa(job #731587)

Utilizator test0Victor test0 Data 8 aprilie 2012 15:11:46
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.76 kb
#include <cstdio>
#include <vector>
#include <queue>
#define MAX 100001
using namespace std;
vector<int>v[MAX];
queue<int>c;
bool viz[MAX];
int n,m,d[MAX];

void bfs(int s){
    int x,y;
    c.push(s);
    viz[s]=1;
    while(c.size()>0){
        x=c.front();
        for(int i=0;i<v[x].size();i++){
            y=v[x][i];
        if(!viz[y]){
            viz[y]=1;
            c.push(y);
            d[y]=d[x]+1; } }
        c.pop(); }
}


int main(){
    int x,y,s;
    freopen("bfs.in","r",stdin);
    freopen("bfs.out","w",stdout);
        scanf("%d %d %d",&n,&m,&s);
        for(int i=1;i<=m;i++){
            scanf("%d %d",&x,&y);
            v[x].push_back(y);}
    bfs(s);
        for(int i=1;i<=n;i++)
        if(d[i]>0||i==s)printf("%d ",d[i]);else printf("-1 ");
}