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Cod sursa(job #645822)
#include <fstream>
#include <queue>
#define NMAX 100000
using namespace std;
int n, m, s;
int viz[NMAX + 1];
struct node{
int inf;
node* next;
} *G[NMAX + 1];
void add(int list, int x){
node *p = new node;
p->inf = x;
p->next = G[list];
G[list] = p;
}
void bfs(int s){
queue<int> q;
int x;
q.push(s);
viz[s] = 1;
while(!q.empty()){
x = q.front();
q.pop();
for(node *p = G[x]; p; p = p->next){
if(!viz[p->inf]){
q.push(p->inf);
viz[p->inf] = 1 + viz[x];
}
}
}
}
int main()
{
ifstream f("bfs.in");
ofstream g("bfs.out");
f >> n >> m >> s;
int i, x, y;
for(i = 0; i < m; ++i){
f >> x >> y;
add(x, y);
//add(y, x);
}
bfs(s);
for(i = 1; i <= n; ++i)
g << viz[i] - 1 << " ";
f.close();
g.close();
return 0;
}