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Cod sursa(job #923462)
#include<fstream>
#include<queue>
#include<list>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n, m, cost[100005], s;
queue <int> q;
list <int> vecini[100005];
void citire() {
int x, y, i;
fin >> n >> m >> s;
for (i = 1; i <= m; i++) {
fin >> x >> y;
vecini[x].push_back(y);
}
}
void setcost() {
int i;
for (i = 1; i <= n; i++)
cost[i] = -1;
}
void afiscost() {
int i;
for (i = 1; i <= n; i++)
fout << cost[i] << " ";
}
int bfs(int start) {
int x, y, i;
cost[start] = 0;
q.push(start);
while (!q.empty()) {
x = q.front();
q.pop();
while (!vecini[x].empty()){
y = vecini[x].front();
vecini[x].pop_front();
if (cost[y] == -1) {
cost[y] = cost[x] + 1;
q.push(y);
}
}
}
}
int main() {
citire();
setcost();
bfs(s);
afiscost();
}