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Cod sursa(job #908550)
#include <fstream>
#include <algorithm>
#include <queue>
#include <iostream>
#define NMAX 10000
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n, m, a[NMAX][NMAX], marc[NMAX], cost[NMAX], start;
queue <int> q;
void citire() {
int i, x, y;
fin >> n >> m >> start;
for (i = 1; i <= m; i++) {
fin >> x >> y;
a[x][y] = 1;
}
fin.close();
}
void bfs(int start) {
int i, x;
marc[start] = 1;
cost[start] = 0;
q.push(start);
while (!q.empty()) {
x = q.front();
q.pop();
// vizitam toti vecinii punctului scos din coada
for (i = 1; i <= n; i++)
if (a[x][i] == 1 and not marc[i]) {
q.push(i); marc[i] = 1; cost[i] = cost[x] + 1;
}
}
}
void setcost() {
for (int i = 1; i <= n; i++)
cost[i] = -1;
}
void afiscost() {
for (int i = 1; i <= n; i++)
fout << cost[i] << ' ';
}
int main() {
citire();
setcost();
bfs(start);
afiscost();
fout.close();
return 0;
}