Cod sursa(job #2955352)

Utilizator mateisirghemateisirghe mateisirghe Data 16 decembrie 2022 20:13:19
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;

#define maxn 100005

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

int n,m,l,start;

vector <int> a[maxn];
queue <int> q;

int g[maxn],cost[maxn];

void BFS(int nod)
{
    memset(cost,-1,sizeof(cost));
    q.push(nod);
    cost[nod]=0;
    while(q.empty()==false)
    {
        int nc=q.front();
        for(int i=0;i<a[nc].size();i++)
        {
            if(cost[a[nc][i]]==-1)
            {
                q.push(a[nc][i]);
                cost[a[nc][i]]=cost[nc]+1;
            }
        }
        q.pop();
    }
}

int main()
{
    int i,x,y;
    in>>n>>m>>start;
    for(i=1;i<=m;i++)
    {
        in>>x>>y;
        a[x].push_back(y);
    }
    for(i=1;i<=n;i++)
    {
        g[i]=a[i].size();
    }
    BFS(start);
    for(i=1;i<=n;i++)
    {
        out<<cost[i]<<" ";
    }
    return 0;
}