Cod sursa(job #2868887)

Utilizator valentina_veleatVeleat Valentina-Georgiana valentina_veleat Data 11 martie 2022 11:20:35
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("bfs.in");ofstream d("bfs.out");
const int maxn=100010;
int n,m,l,st;
vector <int> a[maxn];
int g[maxn],s[maxn],cost[maxn];
void bfs(int nod)
{
    for(int i=1;i<=n;i++)
    {
        cost[i]=-1;
    }
    l=1;cost[nod]=0;s[l]=nod;
    for(int i=1;i<=l;i++)
    {
        for(int j=0;j<g[s[i]];j++)
        {
            if(cost[a[s[i]][j]]==-1)
            {
                s[++l]=a[s[i]][j];
                cost[s[l]]=cost[s[i]]+1;
            }
        }
    }
}
int x,y;
int main()
{
    f>>n>>m>>st;
    for(int i=1;i<=m;i++)
    {
        f>>x>>y;
        a[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
    {
        g[i]=a[i].size();
    }
    bfs(st);
    for(int i=1;i<=n;i++)
    {
        d<<cost[i]<<" ";
    }
    return 0;
}