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Cod sursa(job #742330)
#include<iostream>
#include<fstream>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std;
const int maxn = 100010;
int m,n,nod_sursa,sol[maxn];
vector <int> graf[maxn];
void init()
{
ifstream in("bfs.in");
int i,a,b;
in>>n>>m>>nod_sursa;
for(i=1;i<=m;i++){
in>>a>>b;
graf[a].push_back(b);
}
memset(sol,-1,sizeof(sol));
}
void solve()
{
vector <int> :: iterator it;
queue <int> Q;
int nod;
sol[nod_sursa]=0;
Q.push(nod_sursa);
while(!Q.empty()){
nod=Q.front();
Q.pop();
for(it=graf[nod].begin();it!=graf[nod].end();++it)
if(sol[*it]==-1){
sol[*it]=sol[nod]+1;
Q.push(*it);
}
}
}
void write()
{
ofstream out("bfs.out");
for(int i=1;i<=n;i++)
out<<sol[i]<<" ";
}
int main()
{
init();
solve();
write();
return 0;
}