Cod sursa(job #1217339)
Utilizator | Data | 7 august 2014 03:32:00 | |
---|---|---|---|
Problema | BFS - Parcurgere in latime | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.65 kb |
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int N,M,i,S,d[100005],x,y;
queue<int> Q;
vector<int> v[100005];
int main()
{
f>>N>>M>>S;
while(M--)f>>x>>y,v[x].push_back(y);
for (i=1;i<=N;++i)
d[i]=-1;
d[S]=0;
Q.push(S);
while(!Q.empty())
{
int cr=Q.front();Q.pop();
for (i=0;i<v[cr].size();++i)
if (d[v[cr][i]]==-1)
d[v[cr][i]]=d[cr]+1,Q.push(v[cr][i]);
}
for(i=1;i<=N;++i)
g<<d[i]<<" ";
g << '\n';
g.close();
return 0;
}