Cod sursa(job #2518355)

Utilizator AndreiDeltaBalanici Andrei Daniel AndreiDelta Data 5 ianuarie 2020 16:21:57
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <bits/stdc++.h>
#define Dim 100001
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out"); //0-alb 1-gri 2-negru

vector < int > V[Dim];
queue < int > qu;

int N,M,S,x,y,viz[Dim],D[Dim];

void BFS()
{
    D[S]=0;
    qu.push(S);
    viz[S]=1;
    while(!qu.empty())
    {
        int nod=qu.front();
        qu.pop();
        viz[nod]=2;
        for(unsigned int i=0;i<V[nod].size();i++)
        {
            int vecin=V[nod][i];
            if(!viz[vecin])
            {
                D[vecin]=D[nod]+1;
                viz[vecin]=1;
                qu.push(vecin);
            }
        }
    }
}

int main()
{
    f>>N>>M>>S;
    for(int i=1;i<=M;i++)
    {
        f>>x>>y;
        V[x].push_back(y);
    }
    for(int i=1;i<=N;i++) D[i]=-1;
    BFS();

    for(int i=1;i<=N;i++) g<<D[i]<<" ";

    return 0;
}