Mai intai trebuie sa te autentifici.
Cod sursa(job #2321106)
| Utilizator | Data | 15 ianuarie 2019 18:22:13 | |
|---|---|---|---|
| Problema | BFS - Parcurgere in latime | Scor | 100 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva educationala | Marime | 1.07 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
int a, n, m;
vector <int> v[1000000];
queue <int> Q;
int viz[10000000];
int drum[1000000];
int x, y;
void citire()
{
fin>>n>>m>>a;
for (int i=1; i<=m; i++)
{
fin>>x>>y;
v[x].push_back(y);
}
}
void BFS (int a)
{
Q.push(a);
while(!Q.empty())
{
int nod= Q.front();
Q.pop();
for(auto it : v[nod])
{
if(!viz[it]&&it!=nod)
{
drum[it]=drum[nod]+1;
viz[it]=1;
Q.push(it);
}
}
}
}
void afisare()
{
for(int i=1; i<=n; i++)
{
if(i==a)
{
fout<<"0 ";
}
else
{
if(drum[i]==0)
{
fout<<"-1 ";
}
else fout<<drum[i]<<" ";
}
}
}
int main()
{
citire();
BFS(a);
afisare();
fin.close();
fout.close();
return 0;
}
