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Cod sursa(job #761695)
#include<iostream>
#include<fstream>
#include<vector>
using namespace std;
int cost[100001],l[100001],c[100001],n;
vector <int> v[100001];
inline void bfs(int nod)
{
int i,st,dr;
for(i=1;i<=n;i++)
cost[i]=-1;
st=1;
dr=1;
c[st]=nod;
cost[nod]=0;
while(st<=dr) {
for(i=0;i<=l[c[st]];i++)
if(cost[v[c[st]][i]]==-1) {
cost[v[c[st]][i]]=cost[c[st]]+1;
c[++dr]=v[c[st]][i];
}
st++;
}
}
int main ()
{
int m,i,x,y,s;
ifstream f("bfs.in");
ofstream g("bfs.out");
f>>n>>m>>s;
for(i=1;i<=m;i++) {
f>>x>>y;
v[x].push_back(y);
}
f.close();
for(i=1;i<=n;i++)
l[i]=v[i].size()-1;
bfs(s);
for(i=1;i<=n;i++)
g<<cost[i]<<" ";
g.close();
return 0;
}