Cod sursa(job #2695602)

Utilizator stanbianca611Stan Bianca stanbianca611 Data 13 ianuarie 2021 21:24:23
Problema BFS - Parcurgere in latime Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.86 kb
#include <iostream>
#include <fstream>
#include <bits/stdc++.h>
using namespace std;
ifstream f ("bfs.in");
ofstream g ("bfs.out");
int n, m, s;

vector<int> v[100005];
queue<pair<int, int>> q;
vector<int> viz(100005);

void bfs()
{
    while(!q.empty())
    {
        pair<int, int> x=q.front();
        q.pop();
        viz[x.first]=x.second;
        for(int i=0; i<v[x.first].size(); i++)
        {
            if(viz[v[x.first][i]]==-1)
            {
                q.push(make_pair(v[x.first][i], x.second+1));
            }
        }
    }
}

int main()
{
    f>>n>>m>>s;
    for(int i=0; i<m; i++)
    {
        int x, y;
        f>>x>>y;
        v[x].push_back(y);
    }
    fill(viz.begin(), viz.end(), -1);
    q.push(make_pair(s, 0));
    bfs();
    for(int i=1; i<=n; i++)
    {
        g<<viz[i]<<" ";
    }
    return 0;
}