Cod sursa(job #2601397)

Utilizator bilghinIsleam Bilghin bilghin Data 14 aprilie 2020 13:44:10
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.89 kb
#include <bits/stdc++.h>

using namespace std;

FILE* si=fopen("bfs.in","r");
FILE* so=fopen("bfs.out","w");

vector<int>v[100005];
queue<int>q;
int n,m,s,d[100005],a,b;

void bfs()
{
    int nod,vecin;
    while(q.empty()==0)
    {
        nod=q.front();
        q.pop();
        for(int i=0; i<v[nod].size(); i++)
        {
            vecin=v[nod][i];
            if(d[vecin]==-1)
            {
                q.push(vecin);
                d[vecin]=d[nod]+1;
            }
        }
    }
}

int main()
{
    fscanf(si,"%d%d%d",&n,&m,&s);
    for(int i=1; i<=m; i++)
    {
        fscanf(si,"%d%d",&a,&b);
        v[a].push_back(b);
    }
    for(int i=1; i<=n; i++)
    {
        d[i]=-1;
    }
    d[s]=0;
    q.push(s);
    bfs();
    for(int i=1; i<=n; i++)
    {
        fprintf(so,"%d ",d[i]);
    }

    fclose(si);
    fclose(so);

    return 0;
}