Cod sursa(job #2449387)

Utilizator SilviuCristeaSilviu Cristea SilviuCristea Data 19 august 2019 15:36:23
Problema BFS - Parcurgere in latime Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include <bits/stdc++.h>
#define MAX 100100
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
bool uz[MAX];
int cost[MAX];
queue<int>coada;
vector<int>g[MAX];
int n,m,s;
void citire();
void bfs();
int main()
{
    int i;
    citire();
    coada.push(s);
    bfs();
    for(i=1;i<=n;i++)
        if(cost[i]==0)
        cost[i]=-1;
    cost[s]=0;
    for(i=1;i<=n;i++)
        fout<<cost[i]<<' ';
    return 0;
}
void citire()
{
    int i,x,y;
    fin>>n>>m>>s;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y;
        g[x].push_back(y);
    }
}
void bfs()
{
    int nodcrt,i;
    while(!coada.empty())
    {nodcrt=coada.front();
    uz[nodcrt]=1;
    coada.pop();
    for(i=0;i<g[nodcrt].size();i++)
    {
        if(!uz[g[nodcrt][i]])
            {
                cost[g[nodcrt][i]]=cost[nodcrt]+1;
                coada.push(g[nodcrt][i]);
            }
    }
    }
}