Cod sursa(job #2478689)

Utilizator AlbertUngureanuAlbert AlbertUngureanu Data 22 octombrie 2019 16:14:45
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.96 kb
#include <fstream>
#include <vector>
#include <queue>
#include <cstring>

using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

int N,M,S;
int cost[100005], grad[100005];
vector<int>Map[100005];

void citire()
{
    int x,y;
    fin>>N>>M>>S;
    for(int i=1;i<=M;i++)
    {
        fin>>x>>y;
        Map[x].push_back(y);
    }
    for(int i=1; i<=N; i++)
		grad[i]=Map[i].size();
}

void BFS(int nod)
{
    int P,U;
    queue<int>Q;
    memset(cost,-1,sizeof(cost));
    Q.push(nod);
    cost[nod]=0;
    while(!Q.empty())
    {
        P=Q.front();
        Q.pop();
        for(int i=0;i<grad[P];i++)
        {
            if(cost[Map[P][i]] == -1)
            {
                U=Map[P][i];
                Q.push(U);
                cost[U]=cost[P]+1;
            }

        }
    }
}

int main()
{
    citire();
    BFS(S);
    for(int i=1;i<=N;i++)
        fout<<cost[i]<<" ";
    return 0;
}