Cod sursa(job #2742967)

Utilizator dariadragomir23Dragomir Daria dariadragomir23 Data 22 aprilie 2021 13:16:08
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.71 kb
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector<int> G[100005];
int n, m, s, dmin[100005];
queue<int> q;

void elem()
{
    int nod=q.front();
    q.pop();
    for(auto &nodnou:G[nod])
        if(!dmin[nodnou])
        {
            dmin[nodnou]=dmin[nod]+1;
            q.push(nodnou);
        }
}

void cautare_min()
{
    q.push(s);
    dmin[s]=1;
    while (!q.empty())
        elem();
}

int main()
{
    f>>n>>m>>s;
    int x, y;
    for(int i=0; i<m; i++)
    {
        f>>x>>y;
        G[x].push_back(y);
    }
    cautare_min();
    for(int i=1; i<=n; i++)
        g<<dmin[i]-1<<' ';
    return 0;
}